Strip continuous supply method and apparatus

Abstract

In a feeding apparatus which includes a turret arm supporting a new paper roll and an old paper roll and supported pivotably, and a turret arm swing motor for pivoting the turret arm, and which splices a web of the new paper roll to a web of the old paper roll and supplies the web continuously, the turret arm swing motor is driven before driving of a main unit to pivot the turret arm, thereby moving the new paper roll to a web splicing standby position.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a strip continuous supply method and apparatus suitably applied, for example, to a feeding apparatus of a rotary printing press. [0003] 2. Description of the Related Art [0004] In a machine where a roll (a rolled web) is unwound and used, such as a rotary press, an automatic web splicing unit is used, whereby when a roll being currently unwound (an old web roll) is nearing its end, this roll is automatically spliced to a new roll (a new web roll), without stoppage of the operation of the machine, and the operation is continued. [0005] With the automatic web splicing unit of an offset rotary press, the following procedure has been common practice: When the transport speed of the old web roll reaches a predetermined speed not lower than a low speed and when the length of the remaining web becomes a value corresponding to a predetermined time or less, a web splicing signal is issued. In respon...

AI Technical Summary

Benefits of technology

The present invention relates to a method and apparatus for continuous supply of strip material. The technical effects of this invention include effective utilization of printing materials, increased productivity, and reduction of time taken for web splicing motion. The method involves splicing a strip of new web roll to a strip of old web roll and supplying the strip continuously, which involves driving the turret arm to move the new web roll to a web splicing standby position and moving the web splicing unit to the standby position before the main unit begins to rotate. The new web roll is then driven to match the transport speed of the strip unwound from the old web roll. The apparatus includes a control device for driving the turret arm and a web splicing unit with a pressing member and a cutting member. The method and apparatus allow for efficient use of small diameter web rolls as the old web roll, resulting in increased productivity and reduced time taken for web splicing motion.

Problems solved by technology

However, when printing is started anew, the above-described automatic web splicing unit has encountered the following problems: The movement of the new web roll to the web splicing standby position, and the synchronization of the peripheral speed of the new web roll take time.

During this period, the old web is unwound, and the length of the remaining paper in the roll becomes insufficient.

At the time of printing (during printing-out), therefore, the paper remaining in the wound roll cannot be used as the old web roll, thus resulting in a waste.

In other words, if the remaining roll having the insufficient length of the remaining paper is used as the old web roll, shutdown of the machine due to the absence of remaining paper is induced.

This has posed the problem that printing products obtained become wasted paper, thus causing wastes.

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