JPH03295650A - Automatic register device for form roller in rotary type printing machine - Google Patents

Abstract

PURPOSE:To automate the register of a web by initially setting each form roller with the aid of a reference phase sensor and a rotating degree sensor and further carrying out the automatic fine adjustment of irregularity in the position of the rollers, which is caused by the operation of a gear, with the aid of a camera and a control monitor. CONSTITUTION:After mounting respective form rollers 2 to respective printing units 3, helical gears 16 are rotated to adjust respective crosswise direction sensors 25 to a zero point by a pulse motor 26. Then, a motor 27 for cleaning is actuated by a control unit 9, and the respective form rollers 2 are thereby rotated by a proper phase angle theta. Then, while checking the crosswise direction sensors 25, minute irregularity in the position of the form rollers 2 is ascertained by a camera 10 and a control monitor 8 to input in into the control unit 9 and, by controlling the pulse motor 26, a working body 24 is moved in a crosswise direction to rotate a helical gear 17, there by correcting the phase position of the respective form rollers 2. Then, after the correc tion is ascertained by the camera 10 and the control monitor 8, a rotating knob 18 is rotated so that the crosswise direction of the respective form rollers 2 is also proper ly set. By this method, sharp printing without shift is made possible.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic registration device for plate rollers in a rotary printing press that can automatically register a web in a rotary printing press. .

[Conventional technology]

A rotary multicolor printing press has a plurality of printing units equipped with plate rollers arranged around the outer periphery of an impression cylinder. For example, in the case of a four-color printing press, printing is performed by the first plate roller of the first printing unit. After that, the second edition is rolled out in order.

Printing is repeated with the third and fourth rollers, but at this time, the second, king, and fourth rollers print at the same position as that printed by the -plate roller. Each plate roller must be initially set at the correct phase position, taking into consideration the printing length per rotation and the impression cylinder diameter.

Conventionally, the initial setting of each plate roller was carried out by an operator who operated the printing press and made a test print while checking with the naked eye the register marks of each plate roller printed on the web. This process is complicated, and the more time is spent on this setting, the more web loss occurs.

Furthermore, even if each plate roller is initially set at the appropriate phase position, each plate roller and impression cylinder are usually meshed with gears, so it is possible for them to shift in either direction. Sometimes the initial phase position is not set correctly or the web path between each printing unit is long, especially in multicolor presses, which can cause web stretching between each printing unit. If there is an intervening ink drying process, even if the initial setting is completed accurately, the expansion and contraction of the web will eventually cause the plate rollers to be relatively out of position, causing the vertical registration to be out of order. There is.

Therefore, when an operator visually confirms the misalignment of the vertical register, he or she must rotate the misaligned slope roller while visually checking it to correct the phase position, or, for example, move the correction roller to correct the correct phase position. Register deviations are corrected by increasing or decreasing the length of the web path using, for example, the length of the web path, but there is a problem in that this correction work is also very complicated.

[Problem to be solved by the invention]

Claims (1)

[Claims] In a rotary printing press in which a plurality of printing units equipped with plate rollers are arranged around the outer periphery of an impression cylinder, there is a reference phase sensor that detects the reference phase position of the plate roller, and rotation of the plate roller from the reference phase position. a rotation degree sensor that detects the degree of rotation, a drive unit that rotates the plate roller, a control unit that controls the drive unit, and a camera that photographs the contact state between the plate roller and the impression cylinder;
An automatic register device for plate rollers in a rotary printing press, characterized in that it is equipped with a control monitor that adjusts misalignment based on the image.