GB2025376A

GB2025376A - An arrangement in newspaper printing presses

Info

Publication number: GB2025376A
Application number: GB7923188A
Authority: GB
Original assignee: Bonnierforetagen AB
Current assignee: Bonnierforetagen AB
Priority date: 1978-07-12
Filing date: 1979-07-03
Publication date: 1980-01-23
Also published as: DE2927575A1; DE2927575C2; SE7807762L; SE412218B; FR2430907A1

Abstract

A simple arrangement in newspaper printing presses for locating the joint in a flow of newspapers (16) in flying paste jointing of two paper webs. The end portion of the web which is to be jointed to the next web has a metal foil which is sensed along the paper flow path by an inductive switch (19), actuating a means (18, 17) for diverting an adjustable number of newspapers in the paper flow area surrounding the metal foil, thus removing the newspapers damaged by the joint. <IMAGE>

Description

SPECIFICATION An arrangement in newspaper printing presses The present invention relates to an arrangement in newspaper printing presses, and is intended to facilitate locating the joint obtained in the paper web from so-called flying pasting of a first paper web, advanced in the printing press from a first roll, to a second paper web coiled on a second roll.

In such flying pasting, two or three paper rolls are usually rotatably mounted in a movable stand in the printing press. The end of the paper web on each roll is provided with an outwardly facing free pasting surface which is coated with paste or provided with an adhesive tape so that the end of the paper web can be adhered to a web being advanced. The roll from which the paper web is to be adhered to the advancing web is driven up to the desired rotational speed and at a predetermined instant, before the advanced web runs out, the stand is rapidly moved to a position where the pasted or taped end of the web on the.

roll is brought into contact with the advanced web and attached thereto. At the same time, the advanced web is cut off a distance behind the joint. The joint thus obtained will come into a plurality of printed newspapers, and the portions of both paper webs at a distance on either side of the joint and which are also provided with greater or less damage or marks due to jointing will also come into a plurality of newspapers. In certain cases it will be a question of about a dozen or so newspapers which are more less damaged due to the jointing.

So far, there has not existed any simple and reliable apparatus for determining where the joint is in the flow of newspapers. One method has so far been to estimate the approximate position of the joint in the newspaper flow, based on the time it takes for the joint from the joining instant to move forward to a certain point on the path along which the newspapers flow. With guidance from this estimation, a portion of the newspaper flow has been removed by hand, whereby it has been necessary to embrace a relatively large number of newspapers to ensure the inclusion of all damaged newspapers. This thus means that a relatively large number of undamaged newspapers will also be sorted out.

There are also a plurality of mechanical means for removing nevçspapers from a flow of newspapers, and these means can be said to divert the newspaper flow at a certain location. A fall flap can be used as diverting means, said flap working with a pneumatic cylinder and being controlled by an electric valve obtaining impuises from an operating member.

The object of the present invention is therefore to provide an arrangement enabling accurate determination of the location of the joint in the newspaper flow, and which is disposed for actuating a diverting means so that a predetermined number of newspapers on either side of the joint in the newspaper flow will be diverted. This problem is solved accotding to the invention simply and cheaply with an arrangement having the characterizing features set forth in the annexed claim.

An arrangement according to the invention is illustrated schematically on the accompanying drawing.

Fig. 1 is a schematic side view of a newspaper printing press with supply rollers intended for joining onto the advanced paper web, and Fig. 2 schematically illustrates a paper roll included in the arrangement according to the invention.

A roll stand 10 rotatably mounted about its centre carries three paper rolls 12, 13 and 1 3a.

From the roll 12, a paper web 14 is wound off, which passes into a newspaper printing press 15, from which a flow of newspapers 1 6 are fed out onto a path and can be diverted with the help of a fall flap 1 7 which is operated by a pneumatic cylinder 18 with electric valves in a known way. At a certain point along the path of the newspaper flow, there is an inductive switch 1 9 on the underside of the web, said switch being connected to the electric valve system of the cylinder 1 8 serving as operating means, in such a way that for a given impulse from the switch 19, the fall flap 17 will be opened and divert a predetermined number of newspapers.

In the example shown, the roll 12 is a first roll, and when it begins to run out, the roll 13, being the second roll, is taken down into engagement against the web 14 so that the end of the web on the roll 13 will be adhered to the web 14 and joined thereto. At the same time as this jointing process, the web 14 is cut, as known in the art, by a schematically illustrated knife 20.

In Fig. 2 there is shown the roll 13 with its paper web and its end portion 21 which is conventionally V-shaped. The edge of the end 21 is retained in the position illustrated by a plurality of tape strips 22. Along its edge, the end is coated with paste or provided with an adhesive tape for obtaining a wide adhesive surface 23 intended for bringing into contact with the web 14 for joining the end 21 to the web 14.

As is apparent from Fig. 2, the end 21 of the web is provided with a piece of metal foil 24, e.g.

aluminium foil, which is attached to the end of the paper web, e.g. by pasting, at a predetermined location. When the joint between the two wSbs has been formed, the jointed web will pass through the newspaper press, the newspaper flow after the press subsequently containing a newspaper provided with the metal foil 28. This foil moves along a predetermined path with the flow of newspapers, and passes over the inductive switch 19. This then senses the metal foil and thereby the position of the joint in the newspaper flow is accurately determined. The switch 1 9 thereby provides an impulse for the operating means 18 of the fall flap 17 so that the flap is maintained open long enough for a predetermined number of newspapers before and after the newspaper containing the metal foil can be removed from the newspaper flow. The setting can hereby be made so that all damaged newspapers are removed and only a few undamaged newspapers are sorted out as well.

In combination with a metal foil adhered to the paper web at the jointing location, it is suitable to use a switch of the type Honeywell D 22 as an inductive switch 19. Such an arrangement has been found to function quite satisfactorily in practical tests.

Claims

1. An arrangement in newspaper printing presses for locating the joint obtained in the paper web in flying pasting of a first paper web from a first roll fed into the printing press and to a second paper web coiled up on a second roll, characterized in that a piece of metal foil, such as a tape with aluminium foil, is attached to the end portion, intended for jointing of the second paper web, in that an inductive switch is mounted at a place along the path of the newspaper flow after the printing press, said switch being disposed for sensing the metal foil in a passing newspaper, and that said switch is connected to a means for diverting an adjustable number of newspapers in a region of the newspaper flow coming before and after the newspaper provided with the metal foil.

2. An arrangement in newspaper printing presses substantially as hereinbefore described with reference to and as shown in the accompanying drawings.