JPH0718681Y2 - Folding machine knitting roller - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a nipping roller of a folding machine, in which folds and scratches are not generated on a fold portion of a signature, and particularly to a blade folding of a rotary printing machine. It is suitable for application to a device.

<Prior Art> A web-fed rotary printing press is provided with a folding machine that cuts a dried and cooled web after printing to a predetermined length or folds the web in the width direction or the longitudinal direction of the web. There is. Examples of this folding machine include a former folding device for half-folding a web before cutting along a longitudinal direction of the web by a triangular former, and a half-folding device for folding a web after cutting along a width direction of the web by a folding cylinder. A cylinder folding device that folds in four and a blade folding device that folds a cylinder-folded signature half-fold at a right angle to the fold of this signature with a folding blade are known, and these folding machines are independent according to the specifications of the signature. Or used in combination of two or more.

As shown in FIG. 3, which shows an example of a conventional blade folding device, a pair of ferrules 12 forming a strip-shaped opening are provided on a transport plate 11 to which a signature 10 is transported. A pair of nipping rollers 13a, 13b for forming a fold in the signature 10 are rotatably arranged directly below these ferrules 12, and one nipping roller 13a which is driven to rotate,
The other nipping roller 13b is pressed by the spring force of the compression spring 14. A chopper arm 16 equipped with a folding blade 15 for pushing the signature 10 between these nipping rollers 13a, 13b is pivotally attached to a chopper shaft 17 so as to be swingable, and its base end is driven to rotate. It is eccentrically connected to the crankshaft 18 and is pinned to the link plate 19. Therefore, the folding blade is driven by the rotation of the crankshaft 18.
15 swings up and down so that the signature 10 is gripped between the mouthpieces 12 and between the nipping rollers 13a and 13b. Below the nipping rollers 13a, 13b, a blade wheel shaft 21 having a plurality of arcuate blades 20 fixed at regular intervals is provided.
An impeller 22 having a fold is provided so as to be freely rotatable, and a signature 10 with a fold is formed between adjacent impellers 20 between the impellers 22.
And is transferred onto a delivery belt (not shown).

By the way, the applicant of the present invention discloses, according to Japanese Unexamined Patent Publication No. Sho 60-197567, that the signature 10 with the fold is formed by nipping rollers 13a and 13a.
It was proposed that a signature guide 23 be interposed between the nipping rollers 13a, 13b and the impeller 22 so that the impeller 22 can be smoothly transferred from the b. These signature guides
In order to prevent the signature 10 from being wound around the nipping rollers 13a and 13b, it is necessary to dispose 23 as close as possible to the peripheral surfaces of the nipping rollers 13a and 13b.
As shown in FIG. 4 showing the sectional shape taken along the line IV, an escape groove 24 is formed in a part of the peripheral surface of the nipping rollers 13a, 13b, and the upper end of the signature guide 23 is located there.

<Problems to be Solved by the Invention> As shown in FIG. 5 showing the appearance of a signature formed by the conventional folding machine shown in FIGS. 3 and 4, nipping rollers 13a and 13b are shown. In the part of the signature 10 corresponding to the escape groove 24 of
Since the fold 25 is not formed in principle, the signature 10 swells in the escape groove 24, and the corner 10 where the side wall of this escape groove 24 and the peripheral surfaces of the nipping rollers 13a, 13b intersect causes the signature 10 to be folded. There was a problem that scratches 27 and scratches were generated.

<Means for Solving Problems> The nipping roller of the folding machine according to the present invention includes at least a pair of signature guides that sandwich a signature formed with a fold and face each other and guide passage of the signature. A pair of nipping rollers that are provided with an escape groove of these signature guides on the peripheral surface in an annular shape and form the fold by sandwiching the signature.
In a folder equipped with a folding blade that feeds the signature between the nipping rollers and grips the signature with the nipping roller, a corner where the side wall of the escape groove and the peripheral surface of the nipping roller intersect It is characterized in that it is rounded.

<Operation> Since the corner where the side wall of the clearance groove and the peripheral surface of the nipping roller intersect is rounded, the contact pressure on the nipping roller signature from the peripheral surface of the nipping roller to the clearance groove changes abruptly. It changes gradually without any marks and scratches and scratches are not formed on the signature.

<Embodiment> As shown in FIG. 1 showing the appearance of an embodiment of the nipping roller of the folding machine according to the present invention and FIG. 2 in which the main part is extracted and enlarged, a part of the peripheral surface of the nipping rollers 13a, 13b is shown. In the, the escape groove 24 of the signature guide 23 is formed in an annular shape,
At a corner portion 26 where the side wall of the escape groove 24 and the peripheral surface of the nipping rollers 13a, 13b intersect, a roundness with a radius of curvature R is in a range of H from the peripheral surface of the nipping rollers 13a, 13b. Has been formed. Actually, when the width of the escape groove 24 is 10 mm, it is desirable that the radius of curvature R is 5 mm or more and the height H is 3 mm or more.
Is less than 5 mm or the height H is less than 3 mm, the nipping roller 13 with respect to the bulge portion 28 of the signature 10
The binding power of a and 13b becomes strong, and there is a risk that the signature 10 will be scratched or flawed.

Other configurations may be the same as those of the conventional one shown in FIG. 3, but it goes without saying that the present invention can also be applied to a configuration in which nipping rollers 13a and 13b are arranged in two or more stages vertically. In this case, by displacing the positions of the escape grooves of the upper and lower nipping rollers in the vertical direction in FIG. 1, it becomes possible to form folds over the entire area of the signature 10.

Therefore, the deformed state of the bulge portion 28 of the signature 10 in which no folds are formed becomes close to natural due to the roundness of the corner portion 26, and scratches or flaws are unlikely to occur in the signature 10 as in the conventional case.

<Effects of the Invention> According to the nipping roller of the folding machine of the present invention, since the corners where the peripheral surface of the nipping roller and the side walls of the escape groove intersect are rounded, the peripheral surface of the nipping roller is pinched and the signature is folded. There is no sudden change in the clamping pressure at the boundary between the part where the fold is formed and the part where the fold is not formed, and the shape of the bulge part of the signature left by the escape groove is close to the natural state, It became possible to suppress the generation of scratches and flaws.

[Brief description of drawings]

FIG. 1 is a plan view showing the appearance of an embodiment of a nipping roller of a folding machine according to the present invention, FIG. 2 is an enlarged enlarged view of a main part of the nipping roller, and FIG. FIG. 4 is a sectional view showing the IV-IV arrow, and FIG. 5 is a perspective view showing the appearance of a signature formed thereby. In the figure, reference numeral 10 is a signature, 13a and 13b are nipping rollers, 15 is a folding blade, 16 is a chopper arm, 17 is a chopper shaft, 18 is a crankshaft, 22 is an impeller, and 23 is a signature guide, twenty four
Is an escape groove, 25 is a fold, 26 is a corner portion, 28 is a bulge portion, R is a radius of curvature of the roundness, and H is a height of the roundness.

Claims (1)

[Scope of utility model registration request] 1. At least a pair of signature guides that sandwich a signature having a fold and are opposed to each other and guide passage of the signature, and an escape groove for the signature guide is provided in an annular shape on the circumferential surface. A pair of nipping rollers that sandwich the signature with each other to form the fold, and a folding blade that feeds the signature between the nipping rollers and grips the signature with the nipping roller are provided. In the folding machine, the nipping roller of the folding machine is characterized in that a corner is formed at a corner where a side wall of the escape groove and a peripheral surface of the nipping roller intersect.