JPH0751418B2 - Paper break prevention device for rotary press folding machines - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a paper folding prevention device for a folding machine of a rotary press, and more specifically, for example, like a folding machine of a rotary press,
When it is desired to guide the leading edge of the printing paper along the circumferential surface of the rotating cylinder, a needle-like projecting member that can be retracted along the circumferential surface axial direction of the cylinder is provided, and the projecting member is used to Guiding the leading edge while holding it in a pierced state. At that time, both corners of the leading edge of the paper violently cause fluttering and easily break the ears, and prevent them from occurring. The present invention relates to a paper break prevention device.

[Conventional technology]

As shown in FIG. 5 and FIG. 6, needle-like protruding members 2, 2, 2, ...
When the paper 3 is guided along the peripheral surface of the body 1 while holding the leading edge 3a of the paper 3 by them, the leading edge 3a of the running paper to be guided is apt to be damped, Both side corners 3b, 3b of the edge are extremely unstable, and are prone to flipping and ear breakage (see FIG. 6).

Therefore, in order to reduce such an unstable state as much as possible,
Compared to a portion of the front end edge of the paper 3 where both side corners 3b, 3b contact the peripheral surface of the body 1, that is, a portion closer to both side edges of the peripheral surface of the body 1 than a central portion of the peripheral surface of the body 1. It is well known that the needle-shaped protruding members 2, 2, 2, ... Are closely and closely provided (see FIG. 5).

No. 63-142362 of the Japanese Utility Model Publication No. 63-142362 is such a leading edge portion 3a of the paper 3.
Folding cylinder 1 of the rotary folding machine in order to suppress the flapping and flapping
It is disclosed that the arc-shaped brushes 4, 4, 4, ... Are closely arranged along the circumferential surface direction.

[Problems to be Solved by the Invention]

By the way, the arc-shaped brushes 4, 4, 4 ...
It has a function of suppressing the leading edge 3a of the paper 3 held in a state of being stabbed by the 2, 2, ...

Therefore, as shown in FIGS. 5 and 6, the protruding members 2, 2,
In the central portion of the peripheral surface of the body 1 where the intervals between 2 ... are sparse, the brushes 4, 4, 4, ... Can be arranged in the middle of the adjacent protruding portions while avoiding the protruding portions of the protruding members. Can be achieved.

However, since the width of the brush 4 is wider than the interval between the projecting members at the site near the both side edges of the peripheral surface of the case 1 where the gaps between the projecting sites 2, 2, 2, ... Since it is impossible to dispose the brushes between them, the brushes 4a, 4a have to be provided in a posture separated from the peripheral surface of the body 1 by the protruding height of the protruding member (see FIGS. 5 and 6). ), This is not expected to have the effect of restraining the leading edge side both side corners 3b, 3b of the paper in contact with the peripheral surface of the body 1, and during high speed operation the paper may come off the protruding member and cause troubles such as tearing of the ears. Upset
In the worst case, the paper is wrapped around the body 1 or entangled, causing jamming, and it takes a lot of time and effort to restore the original state.

According to the present invention, in the portions close to the both side edges of the peripheral surface of the case where the protrusion members are closely spaced, the leading edge side corner portions 3b, 3b of the paper are prevented from swaying, fluttering, and edge breakage, and a smooth paper feeding is performed from beginning to end. It is an object to provide a device which, if possible, provides a device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention arranges a plurality of projecting members for guiding the leading edge portion of the paper so as to be retractable along the circumferential surface axial direction of the body, and among the plurality of projecting members. A paper guide having a width narrower than the interval between the adjacent projecting members along the circumferential direction of the circumferential surface of the case between the adjacent projecting members projects from the projecting member at a distance from the circumferential surface of the case. The guides are made narrower than the length and spaced apart at least by a distance corresponding to the paper thickness.In particular, a paper guide made of a hard material is used for the body circumferential surface where the distance between adjacent protruding members is close. Set up.

The hard paper guide may be provided or a brush-type paper guide may be provided on the circumferential surface of the body where the protrusions adjacent to each other have a small interval.

[Action]

In conventional paper restraining with a brush, if the brush is inserted into a portion where the distance between adjacent protruding members is close, the bristle tips interfere with the protruding member and become entangled, causing trouble. Could not be inserted.

On the other hand, the paper guide used in the present invention can be inserted corresponding to the narrow gap even when the concave curved surface along the peripheral surface of the body and the adjacent protruding members are closely spaced. Because it is made with a width and a hard material,
It is possible to reliably suppress the leading edge side both-side corner portions of the paper corresponding to the portion where the intervals of the projecting members are close to each other on the peripheral surface of the case.

In addition, the paper guide used in the present invention can be used sufficiently even for a portion where the intervals of the projecting members are sparse.

〔Example〕

The structure and operation of the present invention will be described below with reference to an embodiment of a folding machine of a rotary press.

In FIG. 1 and FIG. 2, the needle cylinder 1 and the cutting cylinder 5 are 3 to 2.
With a circumferential length of .circleincircle. The needle-shaped protruding members 2, 2, 2 ...
Are arranged in rows at an interval of 120 ° along the circumferential surface of the cutting cylinder 51, and the cutting blades 51, 51 ... Are projected at an interval of 180 ° from each other along the circumferential surface of the cutting cylinder 5.

When the paper 3 is supplied between the two barrels, the leading edge 3a of the paper 3 is pierced and held by the protruding members 2, 2, 2, ... Is rotated 1/3, the paper 3 is pulled out while coming into contact with the peripheral surface 1/3 of the needle cylinder 1, and the cutting blade 51 of the cutting cylinder 5 cuts the paper 3 at that time. At the time of this cutting, the row of the second protruding members 2, 2, 2, ... In the needle cylinder 1 pierces and holds the leading edge portion of the succeeding paper. By repeating the above, the paper is sequentially supplied to the peripheral surface of the needle cylinder 1.

Now, in such a paper holding and feeding mechanism of the body 1, the paper 3
Since the holding of both side corner portions 3b3b of the leading end edge portion 3a becomes unstable, the installation intervals of the projecting members 2, 2, 2, ... Are sparse and relatively unstable in the central portion of the body circumferential surface, which is relatively stable. Set tightly in the parts near both edges of the outer circumference. Then, for the body circumferential surface of the portion where the interval between the protruding portions 2 and 2 adjacent to each other is sparse,
While the conventionally known brushes 4 are provided in a pair, the following shapes are formed on the body peripheral surface of the portion where the protrusion members 2, 2 adjacent to each other are closely spaced with a gap corresponding to at least the paper thickness. Opposite the paper guide 6.

The paper guide 6 has a concave curved surface 6a along the peripheral surface of the body 1,
The receiving end 6b of the paper 3 is smoothly finished, which is made of a hard material having a smooth and strong wear resistance, such as a synthetic resin or a metal, and a width narrower than the space between the projecting members 2 and 2 adjacent to each other. It is desirable to process it into a convex curved surface.

By such action of the paper guides 6, 6, 6, ..., The leading edge side both corners 3b, 3b of the paper 3 are stably guided in a state of being extremely close to the peripheral surface of the cylinder, and the peripheral surface of the needle cylinder 1 is Don't leave or float up. Therefore, the breakage of the paper such as the breakage of the ears is prevented, and the paper 3 is reliably fed.

The paper guide 6 is shown as an integral type in the embodiment shown in FIG. 3, but as shown in the embodiment shown in FIG.
The 6c and the guide surface member 6d may be formed as separate parts, and both may be integrally fixed with a screw or an adhesive.

In the illustrated embodiment, the conventionally known brush-made paper guide 4 is provided opposite to the body circumferential surface of the portion where the intervals between the adjacent protruding members 2 and 2 are sparse, but also in this portion, Instead of the brush, the hard paper guide 6
It is also effective enough to confront.

Further, in the illustrated embodiment, the paper guide 6 is provided for the needle cylinder 1, but the same effect can be obtained even if the paper guide 6 is provided opposite to the other cylinder, for example, the peripheral surface of the grip cylinder 7.

The technical scope of the present invention is not limited to the above-mentioned examples, but extends to all modifications within the scope described in the claims.

〔The invention's effect〕

As described above in detail, in the paper holding by the conventional brush, when the brush is inserted into a portion where the interval between the adjacent protruding members is close, the bristle tips of the brush are entangled with the protruding member and the needle is bent or broken, or Since the bristles of the brush may come off, the brush cannot be inserted into such a narrow gap, and the paper cannot be held down. It took a lot of time and effort to repair it, as it broke, and the paper wrapped around the body, became entangled, and jammed.
The paper guides 6, 6, 6, ... Used in the present invention are formed to have a width that allows the protruding members 2, 2 adjacent to each other to be inserted in correspondence with the narrow gap even in a closely spaced region, and Since the paper 3 has a hardness that can prevent the edge of the paper from violently moving, the corners 3a, 3a on both sides of the leading edge of the paper 3 corresponding thereto can be surely suppressed on the peripheral surface of the body 1, and the protruding member 2, Since the dropout from No. 2 does not occur anymore, the above-described adverse effects that have occurred conventionally are eliminated by the present invention, and smooth paper feeding is guaranteed from beginning to end.

[Brief description of drawings]

FIG. 1 is a front view of the device of the present invention, FIG. 2 is a partial sectional view taken along the line AA of FIG. 1, and FIG. 3 is an embodiment of a paper guide used in the device of the present invention. FIG. 4 is a perspective view showing another embodiment of the paper guide used in the apparatus of the present invention, FIG. 5 is a partial cross-sectional view of the conventional apparatus which is the same as FIG. 2, and FIG. FIG. 7 is a perspective view showing a case where a paper break occurs in the conventional device in FIG. 5. 1 …… Cylinder, 2,2,2 …… Projecting member, 3 …… Paper, 3a …… Its leading edge, 3b, 3b …… Its leading edge both corners, 4,4,4 …… Yen Arc-shaped brush, 4a, 4a ... Arc-shaped brush in the area where the protruding member is dense, 5 ... Cutting cylinder, 51,51 ... Cutting blade, 6,6,6 ... Paper guide, 6a ... Its concave curved surface , 6b ... accepting end of paper 3, 6c ... substrate, 6d ... guide member, 7 ... holding cylinder.

Claims (3)

[Claims] 1. A cylinder, a plurality of protruding members for guiding the leading edge portion of the paper, which are arranged in a line along the circumferential surface axial direction of the cylinder so as to be retractable, and adjacent to each other among the plurality of protruding members. Along the circumferential direction of the cylinder between the projecting members, the distance from the circumferential surface of the case is narrower than the projecting length of the projecting member, and the two members are provided opposite to each other with a gap corresponding to at least the paper thickness. Further, a paper guide having a width narrower than the space between the adjacent projecting members is provided, and a paper guide made of a hard material is used particularly for the body circumferential surface where the space between the projecting members is close. A device for preventing paper breakage in a folding machine or the like of a rotary press, which is installed oppositely. 2. A paper folding prevention device for a folding machine of a rotary press according to claim 1, wherein a paper guide made of a hard material is provided in opposition to the circumferential surface of the body where the intervals between the adjacent projecting members are sparse. apparatus. 3. The paper breakage preventing device for a folding machine of a rotary press according to claim 1, wherein a brush paper guide is provided opposite to the circumferential surface of the region where the protrusions adjacent to each other are spaced apart from each other.