摘要:
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.
摘要:
In a rotary stencil printing press including a rotary screen cylinder which supports a screen printing form and is supported rotatably, and a squeegee which is located within the rotary screen cylinder and, when printing is done, contacts an inner peripheral surface of the screen printing form to transfer ink stored within the rotary screen cylinder to a web via holes of the screen printing form and, when printing is stopped, leaves the inner peripheral surface of the screen printing form, throw-on and throw-off of the squeegee with respect to the inner peripheral surface of the screen printing form, and adjustment of the position of the throw-on are performed by motors.
摘要:
A rotary screen printing press includes, a rotary screen cylinder which supports a screen printing forme 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 forme, 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 forme. The printing press has a setting instrument for setting the length in the transport direction of the material to be printed, and a squeegee throw-on and throw-off control device for controlling the squeegee to be moved to a retreat position in accordance with the length in the transport direction of the material to be printed which has been set by the setting instrument.
摘要:
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.
摘要:
A pile board inserting machine comprises two pile board inserting units installed in combination respectively with the two sheet piling units of a sheet-fed printing press. Printed sheet are delivered alternately to the two pile board inserting units every time a predetermined number of printed sheets are delivered to each sheet piling unit, and the pile board inserting unit associated with the inoperative sheet piling unit is operated to insert a pile board while the sheet piling unit is at rest. Each pile board inserting unit comprises a lifting bar for lifting stacked pile boards, a pile board inserting mechanism for pushing the top pile board into the sheet piling unit, a lower limit detecting switch for detecting the arrival of the lifting bard at a lowermost position, an automatic start switch which starts lifting bar raising operation only when the lower limit detecting switch is closed, warning devices which provides an alarm upon the reduction of the number of pile boards on the lifting bars to a predetermined number, and stopping devices for stopping the printing press after the duration of the alarm has exceeded a predetermined time. The pile board is inserted automatically into the sheet piling unit, and the operator is warned of the reduction of the pile board on the lifting bars by the alarm.
摘要:
A press plate positioning apparatus for an automatic drawing machine so as to form punch holes at a punch hole forming edge of a press plate placed and fixed on a drawing board and draw registration marks at predetermined positions, has: an elongated cam plate extending in parallel with a positioning edge of the press plate which extends from the drawing board and which is perpendicular to the punch hole forming edge, the elongated cam plate being moved in a direction parallel to the positioning edge and being provided with a plurality of cam surfaces which are arranged in the longitudinal direction thereof and each of which has a plurality of stepwise horizontal surfaces and at least one inclined surface connecting the stepwise horizontal surfaces; and a plurality of positioning blocks, each of the positioning blocks being adapted not to be moved with respect to the positioning edge, being biased downward, being guided together with a corresponding gripper block such that each positioning block is vertically moved by a behavior of the cam surface upon reciprocal movement of the cam plate so as to bring the positioning edge into contact with one of stepwise vertical surfaces, and being locked in position by clicking means.
摘要:
An upstream-side printing unit group and a downstream-side printing unit group, respectively, are driven by separate prime motors and synchronously controlled. In addition to rotary encoders for the upstream-side and downstream-side prime motors, rotary encoders are provided on a last impression cylinder of the upstream-side printing unit group and a first transfer cylinder of the downstream-side printing unit group to detect differences between rotational phases, which the upstream-side and downstream-side printing unit groups should have, and the actual rotational phase of the last impression cylinder of the upstream-side printing unit group or the first transfer cylinder of the downstream-side printing unit group. In accordance with the rotational phase differences, the rotational speeds of the prime motors are corrected.
摘要:
Disclosed is a contact-pressure adjusting method and a contact-pressure adjusting system, each of which automatically adjusts the contact pressure between two rotors, for a liquid application machine including: a first rotor to which liquid is supplied; a second rotor to which the liquid is supplied from the first rotor; and a contact-pressure adjusting unit for adjusting the contact pressure between the first rotor and the second rotor. By using a temperature measuring unit, measured is: the temperature of at least one of the surfaces of the first and second rotors; the temperature of at least one of the liquid on the surface of the first rotor and the liquid on the surface of the second rotor; or the temperature of at least one of the vicinity of the first rotor and the vicinity of the second rotor. The contact-pressure adjusting unit is adjusted in accordance with the measured temperature.
摘要:
A rotary screen printing press includes, a rotary screen cylinder which supports a screen printing forme 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 forme, 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 forme. 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 forme during printing in accordance with the type and thickness of the material to be printed.
摘要:
In an intaglio printing press, a sheet printed by an impression cylinder impressed on a plate cylinder, ink rollers for transferring ink impressed on said plate cylinder and the sheet transmitted with held by the impression cylinder and the plate cylinder after the sheet fed from a feeder transmitted from an upstream of a feeder board to a downstream of the feeder board, the ink rollers are impressed on when the first sheet from starting sheet supply is positioned at the upstream of the feeder board and the impression cylinder is impressed on when the first sheet is arrived at the down stream of the feeder board so that an impression-on timing is hastened so as to transfer an ink on the plate cylinder to the first sheet when the first sheet is arrived between the impression cylinder and the plate cylinder, and the sheet supplying is stopped and the ink rollers and the impression cylinder are thrown off impression when an irregular register occurs in a printing operation.