Transfer device for folder unit

Abstract

In a transfer device R, which feeds a first web group W20 obtained by overlapping a plurality of webs and vertically folding them in a half width by a former F11 and a second web group W10 of a plurality of overlapped webs in the same width dimension as that of the first web group W20 vertically folded by the former F11 in mutual overlap between a cutting cylinder C1 and a folding cylinder C2, so as to form a newspaper signature, wherein at least one transfer roller R1, R2, R3, or R3′ is provided for guiding the second web group W10 to a position at which it is overlapped on the first web group W20 and at least one out of the transfer rollers is rotationally driven, at least one of the transfer rollers to be driven is a roller having a step formed at a peripheral surface in a range in contact with the web while circumferential surfaces having different diameters in an axial direction are adjacent to each other, thus providing the transfer device for a folder unit capable of applying an appropriate tension to each of the webs constituting the web group, so as to prevent the web from being deviated or meandering.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The preset invention relates to a transfer device for a folder unit, which, in a web-fed press, feeds a first web group obtained by overlapping a plurality of webs and vertically folding them in a half width by a former and a second web group consisting of a plurality of webs in the same width dimension as that of the first web group vertically folded by the former in mutual overlap between a cutting cylinder and a folding cylinder, so as to form a newspaper signature, wherein at least one transfer roller is provided for guiding the second web group to a position at which it is overlapped on the first web group, at least one transfer roller being rotationally driven.[0003]2. Description of the Prior Art[0004]A newspaper signature is normally formed by a web-fed press, as follows: a longitudinal dimension of a web is determined in accordance with a predetermined cut dimension in a folder unit; a plurality of printed webs...

AI Technical Summary

Benefits of technology

[0016]In order to solve the above-described problems experienced by the prior art, an object of the present invention is to provide a transfer device for a folder unit capable of applying an appropriate tension to each of webs constituting a web group, so as to prevent the web from being deviated or meandering.

[0019]In the transfer device for the folder unit according to the present invention, the transfer roller is the roller having the step formed in the range with which the web is brought into contact adjacently to the circumferential surface having the different diameters in the axial direction, so that the web path detours within the range in contact with the small-diameter portions with respect to the range in contact with the large-diameter portions of the transfer roller in the web group in contact with the transfer roller at the roll angle, and accordingly, each of the webs is firmly pressed against the surface of the transfer roller. In contrast, each of the webs is weakly pressed against the surface of the transfer roller in the range in contact with the small-diameter portions, and therefore, an air layer taken in between the webs is pushed out from between the webs in contact with the large-diameter portions firmly pressed against the transfer roller toward the range in contact with the small-diameter portions at which the pressing force is weak, thereby dissipating the air layer taken in between the webs in contact with the large-diameter portions. In this manner, the webs are brought into contact with each other at the large-diameter portions on the transfer roller, thus transmitting the power generated by the frictional force. As a consequence, it is possible to apply an appropriate tension to each of the webs constituting the web group, so as to prevent the web from being deviated or meandering.

[0021]In this manner, in addition to the above-described effect, there are further produced the following effects.

[0022]Since the overlapped webs function as a cushion in the case of the greater number of webs, an effect of pushing out the air layer at the large-diameter portions becomes weaker in the web remoter from the surface of the transfer roller in contact with one of the transfer rollers having the step formed at the peripheral surface via the plurality of webs. As a consequence, in the case where much air is taken in between the webs, the web remoter from the surface of the transfer roller cannot sufficiently push out the air layer even at the large-diameter portions, thereby making it difficult to transmit the power generated by the frictional force from the surface of the transfer roller. In view of this, one of the transfer rollers is disposed in the vicinity of the other transfer roller, both of the transfer rollers being brought into contact with the different sides of the second web group at the roll angle, so that the power can be sufficiently transmitted, from the other transfer roller, even to the web remoter from the surface of one of the transfer rollers, thus applying the appropriate tension to the entire web constituting the web group. Consequently, it is possible to further enhance the effect of preventing the web from being deviated or meandering.

[0026]In these preferred modes, a traveling tension to be applied to the web group in the width direction can be balanced, thus eliminating any occurrence of deviation.

Problems solved by technology

Therefore, the tension of the web group to be transferred is decreased due to extension generated in the traveling direction or the rotational resistance of the transfer roller during the traveling on the web paths in the transfer device, so that the web meanders caused by its movement in the width direction during its traveling, thereby raising a problem of degradation of the quality of the folding signature.

In this way, since the appropriate tension cannot be applied to each of the webs constituting the web group B, the web meanders while being moved in the width direction during its traveling, thus degrading the quality of the folding signature.

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