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: A printing system includes an ink-amount control unit for controlling the amount of ink to be supplied to a printing press based upon an image area rate contained in a pre-press data, and at least one ink-amount calculation unit for calculating the image area rate. The ink-amount control unit is connected to the at least one ink-amount calculation unit on a network.

Abstract: A printing unit of a sheet-fed printing press for printing on sheets includes a plate cylinder having a circumference, on which a recess is formed; a feed reel mounted within the recess for feeding a printing film onto the circumference of the plate cylinder so as to introduce an image forming region for each printing operation; an image forming device for forming an image on the image forming region of the printing film fed on the circumference of the plate cylinder with the first edge of the image forming region positioned at an edge of the recess closer to the rewind reel; a rewind reel mounted within the recess for rewinding the printing film from the circumference of the plate cylinder; and a control unit for controlling the length of the printing film to be fed from the feed reel onto the circumference of the plate cylinder, based upon the length of sheets to be printed for each printing operation.

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: A cooling arrangement for uniformly cooling an entirety of a die-casting metal mold is provided. Cooling oil is supplied from temperature controllers (9, 10) by pumps to respective coolant passages (A,B,C,D,E,F,G) through coolant supply circuits (5,6) and through manifolds (5B,6B) where the coolant is branched for cooling a predetermined portion of the metal mold (2). Then, the cooling oil discharged from the respective coolant passages (A,B,C,D,E,F,G) are returned to the temperature controllers (9,10) through coolant discharge passages (7,8) and is cooled by cooling device (11, 12). The cooled cooling oil is again supplied to the coolant supply circuits (5,6). The coolant passages (A through G) are grouped into two groups, and the temperature controllers and the coolant circulation circuits are also grouped into each group to perform coolant supply control and temperature control independently of each group.

Abstract: There is provided a double-sided printing press that includes a sheet-turning-over mechanism for turning sheets upside down at a sheet-turning-timing according to a set length of sheets, which has been previously set for the sheet-turning-over mechanism; and a sheet-length-detection means for detecting the length of sheets, which are fed to the sheet-turning-over mechanism; wherein where the length of sheets, which are fed to the sheet-turning-over mechanism and detected by the sheet-length-detection means, is deferent from the set length of sheets as a result of comparison therebetween, the sheets are stopped from being transferred to the sheet-turning-over mechanism.

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: A tool holder, for mounting a bit formed with a groove onto a power tool, includes a tool-holding tool, an engagement member, and a resilient member. The tool-holding tube defines a bit insertion hole that extends in an axial direction. The tool-holding tube is formed with an elongated hole that is in connection with the bit insertion hole and that extends in the axial direction. The engagement member is disposed in the elongated hole and partially protrudes into the bit insertion hole. The engagement member is movable, by abutment with and pressing force from the bit being inserted into the bit insertion hole, in the axial direction and, when located at a retraction position in the axial direction, also outward in a radial direction of the tool-holding tube. The resilient member is disposed to an outer periphery of the tool-holding tube at the retraction position.

Abstract: An aluminum alloy for high pressure die-casting capable of providing a sufficient castability and a tensile strength of not less than 320 MPa and elongation of not less than 20%, The aluminum alloy contains from 3.6 to 5.5 mass % of Mg, from 0.6 to 1.2 mass % of Mn, from 0.2 to less than 0.5 mass % of Ni, from 0.001 to 0.010 mass % of Be, from 0.01 to 0.3 mass % of Ti, from 0.001 to 0.05 mass % of B, and the balance aluminum and inevitable impurities. The aluminum alloy is particularly available as a material of a vehicle frame and a vehicle body.

Abstract: A printing unit, a sheet-feeding unit, a sheet-discharging unit, an ink-feeding unit and a roller-oscillating unit of a digital printing press are adapted to receive the driving force from a common motor. An image-forming device fixedly mounted on the digital printing press is adapted to form images on printing plates mounted on the printing unit as the plate cylinder rotates upon receiving the driving force from the common motor. The transmission of the driving force to at least two of the sheet-feeding unit, the sheet-discharging unit, the ink-feeding unit and the roller-oscillating unit is shut off by means of a single clutch during the image-forming operation.

Abstract: An apparatus for controlling ink supply by varying the opening degree of an ink fountain key according to a measured density of a printed matter includes a control means for determining a reference correction value of the opening degree of the ink fountain key according to a density difference between a target density of the printed matter or a reference density and a measured density, and determining a correction value by multiplying the reference correction value by a coefficient having a value of more than 1. The control means controls the ink fountain key according to the correction value of the opening degree of the ink fountain key until the number of sheets printed from the start of the printing exceeds a predetermined number, and controls the ink fountain key according to the reference correction value after the number of sheets printed exceeds the predetermined number.

Abstract: A multiple color offset printer having a sheet feed mechanism in which a sheet feed cylinder receives a sheet in timed relation to a sheet transfer timing from the sheet feed cylinder to an impression cylinder. A blanket cylinder is divided into a plurality of uniform sized color sections around its periphery. The sheet feed cylinder has an outer peripheral length that is the same length as the peripheral length of each color section of the blanket cylinder. A sheet is transferred from the sheet feed cylinder to the impression cylinder once each time the sheet feed cylinder rotates a number of times equivalent to the number of color sections. A front lay cam rotates a single time during the same number of rotations as the number of the color sections. An abutment member moves from a projecting position in the sheet transport pathway to a retracted position separated therefrom a single time each time the front lay cam rotates a single time, so that a sheet is allowed to be supplied to the sheet feed cylinder.

Abstract: A method for producing a cylinder block capable of providing sufficient bonding between the cylinder liner and a block body. The cylinder block producing method includes an inner peripheral surface roughening process, outer peripheral surface roughening process, adiabatic particle adhesion process, and melt bonding process. In the inner peripheral surface roughening process, shot blasting is performed to the inner surface of the cylinder liner. In the outer peripheral surface roughening process, semi-spherical dimples are formed on the outer surface of the cylinder liner by sinking the shot balls by their semi-spherical amount into the liner by means of shot blasting. Zn balls and stainless beads each having diameter of 0.4 mm, or Zn balls having diameter of 0.8 mm are used as the shot balls. In the adiabatic particle adhesion process, BN particles are adhered to the inner surface of the cylinder liner.

Abstract: A tool holder, for mounting a bit formed with a groove onto a power tool, includes a tool-holding tool, an engagement member, and a resilient member. The tool-holding tube defines a bit insertion hole that extends in an axial direction. The tool-holding tube is formed with an elongated hole that is in connection with the bit insertion hole and that extends in the axial direction. The engagement member is disposed in the elongated hole and partially protrudes into the bit insertion hole. The engagement member is movable, by abutment with and pressing force from the bit being inserted into the bit insertion hole, in the axial direction and, when located at a retraction position in the axial direction, also outward in a radial direction of the tool-holding tube. The resilient member is disposed to an outer periphery of the tool-holding tube at the retraction position.

Abstract: The present invention provides a method of detecting the locations of right and left register marks respectively burned onto right- and left-hand side portions of a printing plate based upon image data of images respectively captured within an image processing area with right and left vertical edges respectively extending in the Y-direction, and upper and lower horizontal edges extending in the X-direction.

Abstract: An offset printing machine including an impression cylinder, a sheet feed cylinder and a blanket cylinder. An outer peripheral surface of the blanket cylinder is divided into a plurality of color sections in a circumferential direction thereof, and an outer peripheral surface of the sheet feed cylinder has a peripheral length equal to the circumferential length of each color section. A sheet held in the sheet feed cylinder is transferred to the impression cylinder each time the sheet feed cylinder rotates a predetermined number equal to the number of the color sections. One of impression cylinder grippers and a sheet feed cylinder gripper intermittently confront with each other upon rotation of these cylinders.

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: An aluminum alloy for high pressure die-casting capable of providing a sufficient castability and a tensile strength of not less than 320 MPa and elongation of not less than 20%, The aluminum alloy contains from 3.6 to 5.5 mass % of Mg, from 0.6 to 1.2 mass % of Mn, from 0.2 to less than 0.5 mass % of Ni, from 0.001 to 0.010 mass % of Be, from 0.01 to 0.3 mass % of Ti, from 0.001 to 0.05 mass % of B, and the balance aluminum and inevitable impurities. The aluminum alloy is particularly available as a material of a vehicle frame and a vehicle body.