Abstract:
According to a drive control method and apparatus, an offset printing section and an intaglio printing section are connected together by a gear train. Separately from an offset printing section prime motor for driving an entire sheet-fed printing press, an intaglio printing section auxiliary motor is provided in the intaglio printing section where load is heaviest and load variations are great. By so doing, the entire sheet-fed printing press is driven by the offset printing section prime motor and the intaglio printing section auxiliary motor. Moreover, the electric current value (driving torque value) of the intaglio printing section auxiliary motor is controlled in accordance with an electric current value (torque value) for driving the offset printing section prime motor, the torque distribution rate of the intaglio printing section auxiliary motor, and the rated electric current value of the intaglio printing section auxiliary motor.
Abstract:
In a sheet-fed printing press including; an impression cylinder gear driven by an upstream drive motor of an upstream printing unit group; an impression cylinder rotationally driven by the impression cylinder gear; a transfer cylinder gear of a convertible press mechanism rotationally driven by the upstream drive motor through the impression cylinder; and a transfer cylinder which is provided with a notch and is rotationally driven by the transfer cylinder gear, a load motor is provided to the transfer cylinder or the transfer cylinder gear, and braking force of the load motor is controlled according to load on the upstream drive motor.
Abstract:
A synchronous control method and apparatus for a rotary stencil printing press individually drive a rotary screen cylinder by a dedicated drive motor, can set how many rotations have been made before arrival of a sheet at a screen printing unit when synchronous control of the drive motor with respect to a prime motor of a sheet-fed offset printing press is started, and stop the rotation of the rotary screen cylinder until the start of the synchronous control.
Abstract:
A rotary screen printing press includes, a rotary screen cylinder which supports a screen printing form and is supported rotatably; an impression cylinder which is provided to oppose the rotary screen cylinder, and is supported rotatably; and a squeegee which is located within the rotary screen cylinder and, during printing, contacts an inner peripheral surface of the screen printing form, while being pressed against it, to transfer ink stored within the rotary screen cylinder to a material to be printed, which is held on the impression cylinder, via holes of the screen printing form. The printing press has a squeegee throw-on and throw-off control device which controls the pressing force of the squeegee acting on the inner peripheral surface of the screen printing form during printing in accordance with the type and thickness of the material to be printed.
Abstract:
A synchronous control method and apparatus are disclosed for a web rotary printing press which comprises a first printing press, a second printing press, a drive motor for driving the second printing press, and a folder provided in the first printing press, and enables a web printed by the first printing press and a web printed by the second printing press to be superposed and folded by the folder. The synchronous control apparatus comprises a pattern phase deviation detecting sensor provided halfway through a transport path, on which the web printed by the second printing press is transferred so that the web is superposed on a web printed by the first printing press, and adapted to measure the position of a pattern printed by the second printing press, and a pattern phase deviation computing device and a central control device for controlling the rotation phase of the drive motor based on the position of the pattern printed by the second printing press, the position having been measured by the sensor.
Abstract:
A synchronous control device which is provided with drive motors and a central control unit generating a synchronous reference signal and with which the drive motor is controlled to rotate synchronously with the synchronous reference signal supplied from the central control unit, which is provided with: device motor brakes for braking a rotation of the drive motor; machine home position detectors for detecting a rotation phase of the drive motor; and drive controlling means for controlling a drive motor in such a manner that the drive braking means is activated depending on a stop instruction supplied from the central control unit and a required rotation phase of the drive motor is stored; a comparison between the required rotation phase of the drive motor and the rotation phase thereof is performed at the time of re-start; and a home position alignment of the drive motor is performed at a start time of a subsequent operation.
Abstract:
In order to place web offset printing presses A and B in a synchronous operation condition by simple operation with a reduce burden to the operator, actuation of a drive clutch and a folder clutch of the machine A alone and actuation of a drive clutch of the machine B along are made detectable on a synchronous operation control panel and, under control of the control panel, a synchronous operation clutch is actuated with phase matching between the machines A and B, thereby enabling synchronous operation.
Abstract:
A contact pressure adjusting method and a contact pressure adjusting apparatus for a printing press, which can adjust a contact pressure automatically and always highly accurately without the influence of mechanical oscillations (disturbance such as noise), are provided. For this purpose, the contact pressure (load) of a wiping roll on an intaglio cylinder is converted into the torque value (electric current value) of a wiping roll drive motor, and given as feedback to a wiping roll contact pressure adjusting motor.
Abstract:
Provided are an ink supply amount adjustment method and system for a relief printing press including: a first rotor, such as an ink form roller, to which ink is supplied; a second rotor, such as a plate cylinder, to which the ink is supplied from the first rotor; and adjustment means, such as a motor, for adjusting, for example, the nip pressure between the first rotor and the second rotor. The width of a line portion printed on paper W by the relief printing press is measured by a line-width measuring camera, and the adjustment means such as the motor is controlled on the basis of the line portion width obtained by the line-width measuring camera.
Abstract:
A printing quality control method and apparatus are disclosed for an intaglio printing press including an intaglio cylinder which is supplied with ink, an impression cylinder opposing the intaglio cylinder, and holding a sheet which is supplied with the ink from the intaglio cylinder, and a motor for adjusting a printing pressure between the intaglio cylinder and the impression cylinder. The emboss amount of a printing product of printing by the intaglio printing press is measured by a face side distance measuring instrument and a reverse side distance measuring instrument, and the motor for adjusting the printing pressure between the intaglio cylinder and the impression cylinder is drivingly controlled based on the emboss amount measured.