Miyakoshi Printing Machinery Co., Ltd.

Masaru Ohba

Hideo Izawa

Toshiaki Kishine

A method of makeready for a web printing press of the type wherein a web of paper or the like is fed through a print station and a perforating or like processing station driven by first and second drive shaft sections, respectively, which are normally held interconnected via a clutch for joint rotation and which are declutched to allow the print station to operate independently of the processing station. For reconnecting the two drive shaft sections in phase, the method comprises counting the number of revolutions of the first drive shaft section after the same has been declutched from the second drive shaft section, as by a CPU connected to receive electric pulses representative of the revolutions of the first drive shaft section. Upon reception of a clutch engage command from a manually actuable control panel, the CPU computes the additional number of revolutions required for the first drive shaft section before being reconnected in phase to the second drive shaft section. The CPU puts out a signal for causing the reengagement of the clutch when the first drive shaft section completes the above computed additional number of revolutions.

Method of reconnecting drive shaft sections in phase in a web printing

For image registration as in a web fed, multiple color printing press, printing plates are employed each bearing a registration mark having a first line segment extending transversely of the web and a second line segment extending aslantly of the web. The registration marks are so located on the printing plates that their images reproduced on the web are in a row arranged longitudinally of the web and with spacings from one to another. The printed images of the registration marks on the traveling web are sensed optically in order to determine the actual distances between them and between the first and second line segments of each registration mark. The thus ascertained actual distances are converted into corresponding numbers of reference pulses, and these pulse numbers are compared with reference pulse numbers representative of the proper distances. The angular positions of the plate cylinders are adjusted in accordance with the differences between the pulse numbers representative of the actual distances between the registration mark images and the corresponding proper pulse numbers, whereas the lateral positions of the plate cylinders are adjusted in accordance with the difference between the pulse number representative of the actual distance between the first and second line segments of each mark and the corresponding proper pulse number.

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Funabashi, Japan

Masaru Ohba