JP2007276932A - Folder for rotary press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folder for a rotary press capable of approximately completely preventing unnecessary folding. <P>SOLUTION: The folder 1 of the rotary press with a pair of folding rollers 21, 22 for performing second folding of newspaper 10 is equipped with a folding prevention guide 6 at least part of which is provided inside a space 54 surrounded by a folding barrel 41 and the pair of folding rollers 21, 22 and of which tip part has a shape for smoothly guiding the newspaper 10 to the folding rollers 21, 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a folding machine of a rotary printing press, and in particular, when a pair of folding rollers perform second folding of printing paper, unnecessary folding (top folding, ground folding) generated at the end of printing paper is prevented. The present invention relates to a folding machine of a rotary printing press provided with a folding prevention guide.

Generally, a newspaper rotary press is roughly classified into a printing machine (printing unit) and a folding machine (folding unit).
The above-mentioned newspaper rotary press (also referred to as a rotary press) is a former provided in the upper part of the folding machine by feeding continuous paper printed by the printing machine to the folding machine while being guided by the rail frame. First fold, then guide between the folding cylinder and the saw cylinder. Thereafter, a paper pulling needle provided on the folding cylinder and swinging and protruding at a predetermined timing is pierced at an appropriate position corresponding to the margin of the printing surface of the guided continuous paper, and the continuous paper is fixed to the circumferential surface of the folding cylinder. Thereby, the continuous paper fixed by the paper pulling needle is wound around the folding drum circumferential surface as the folding drum rotates. Subsequently, when the saw blade provided on the saw cylinder and the cutting rubber provided on the folding cylinder rotate and move together with the rotation of the saw cylinder and the folding cylinder, and face each other, the continuous paper wound around the folding cylinder is transferred to the newspaper. Cut to a predetermined length.

At substantially the same timing as the saw blade and the cutting rubber cut the continuous paper wound around the folding cylinder, the paper pulling needle protruding from the folding cylinder retracts into the folding cylinder and comes out of the continuous paper. Furthermore, at almost the same timing as this, the folding blade provided on the folding cylinder pushes the ground-side edge portion and the top-side edge portion of the cut newsprint downward, and the center of the pushed newsprint The portion is pushed into the gap between the pair of folding rollers, and the pair of rotating folding rollers moves the newspaper downward so that the second folding of the newspaper is performed.
This state will be described with reference to the drawings.

(Conventional example)
3A and 3B are schematic views of a main part of a folding machine of a rotary printing press according to a conventional example. FIG. 3A is a plan view, and FIG. 3B is a BB for explaining a state in which second folding is performed. A cross-sectional view is shown.
In FIG. 2A, the folding machine 100 includes a pair of the top side folding roller 121 and the ground side folding roller 22 facing each other, and a plurality of top side guides 31 and ground side guides 32 that are arranged to face each other. It has.

  The top side folding roller 121 and the ground side folding roller 22 are arranged to face each other with a small gap so that the second folded newspaper 10 passes through. Further, the top side folding roller 121 and the ground side folding roller 22 have relief grooves 23 formed in the circumferential direction at eight locations along the axial direction, and paper pulling needles (not shown) protruding from the folding cylinder 41. ) Rotate through the escape groove 23. Of the eight escape grooves 23, the two escape grooves 23 on the peller side are formed at a narrower interval than the others, and the paper pulling needle firmly supports the peller side of the newspaper 10.

  In FIG. 5B, the folding blade 42 moving along the hyposideroid curve pushes the ground-side edge portion and the top-side edge portion of the cut newspaper 10 downward and pushes it. A central portion of the newspaper 10 is pushed into a gap between the pair of folding rollers 121 and 22. At this time, the top edge of the newspaper 10 is cut and free, and the ground edge is free when the paper pulling needle is pulled out. In order to guide both ends in the free state, ten top guides 31 and ground guides 32 are provided at opposing positions. Further, among the ten top guides 31 and the ground side guides 32, the three on the peller side are provided in a state where the side surfaces are in contact with each other, and unnecessary folding that easily occurs on the peller side of the newspaper 10 is provided. The effect of preventing (peller side folds, pella side landslides) is enhanced.

  The top guide 31 and the ground guide 32 have curved surfaces having a radius of curvature larger than the radius of the folding cylinder 41 for guiding the newspaper 10. The tip of the top guide 31 on the top folding roller 121 side is located outside the virtual plane 51 including the rotation center of the folding cylinder 41 and the rotation center of the top folding roller 121. Further, the tip of the ground side guide 32 on the ground folding roller 22 side is located outside the virtual plane 52 including the rotation center of the folding cylinder 41 and the rotation center of the ground folding roller 22.

  Although not shown, the rotary printing press includes a paper discharge device having a delivery fan and a delivery belt below the folding machine 100. In this paper discharge device, the delivery fan receives the newspaper 10 which has been discharged from the pair of folding rollers 121 and 22 and is folded second by a guide while the delivery fan rotates, and the newspaper 100 is folded. The newspaper 10 is placed on the delivery belt that is discharged to the outside, and the second folded newspaper 10 is discharged out of the folding machine 100.

Next, unnecessary folding of the newspaper 10 by the folding machine 100 (appropriately abbreviated as folding) will be described with reference to the drawings.
FIG. 4 is a schematic view for explaining unnecessary folding by a folding machine of a rotary printing press according to a conventional example, and (a) is an enlarged cross-sectional view for explaining a state in which the second folding is performed. (B) is an enlarged cross-sectional view for explaining the state of the final stage of the second fold, (c) is an enlarged cross-sectional view for explaining a state in which unnecessary folding occurs, and (d) is unnecessary. The perspective view of the newspaper in which the folding has occurred is shown.
In FIG. 2A, the newspaper 10 is secondly folded by being sent downward while being sandwiched between the top folding roller 121 and the ground folding roller 22.
The folding rollers 121 and 22 are subjected to surface processing that increases the frictional resistance such as a streak shape. Further, the circumferential speed of the folding rollers 121 and 22 is designed to be higher than the circumferential speed of the folding cylinder 41 in order to prevent a collision between the second folded newspaper 10 and the next newspaper 10.

  The newspaper 10 passes through the folding rollers 121 and 22 while ensuring the second folding, but the ground side end and the top side end are in a free state and are guided to the ground side guide 32 and the top side guide 31. While being done, it is drawn into the folding rollers 121 and 22. At this time, since the end of the newspaper 10 is pulled by the folding cylinder 41 in the rotation direction of the folding cylinder 41 and the top end is pushed by the folding cylinder 41, the pair of folding rollers 121, 22 The newspaper 10 before being sandwiched is gently bent (with a large radius of curvature) on the ground side, while being sharply (with a small radius of curvature) on the top side.

  Next, as shown in FIG. 4B, when the second folding final stage is entered, that is, the space 54 (more precisely, surrounded by the folding cylinder 41 and the pair of folding rollers 121, 22). Surrounded by the folding cylinder 41, the top folding roller 121 and the ground folding roller 22, and sandwiched between the virtual planes 51 and 52, the rotation center of the top folding roller 121 and the ground folding roller 22 When the top side edge portion and the ground side edge portion of the newspaper 10 enter the space 54 above the virtual plane 53 including the rotation center, the both end portions become completely free and move to the center side.

  Next, both end portions moved to the center side collide, and move to the anti-center side by the reaction force. At this time, folding occurs as shown in FIG. 5C due to subtle factors related to the collision. The subtle factors include a disordered air flow caused by rotation of the folding cylinder 41 and the folding rollers 121 and 22 in the space 54, and air generated when the newspaper 10 is drawn into the folding rollers 121 and 22. , The influence of the inertial force at the top edge and the ground edge at the free state, the force drawn into the folding rollers 121 and 22, the rigidity of the newsprint 10, the material related to the habit, the ink This includes the amount of printing, the amount of dampening water, and the number of pages of newspaper. That is, due to subtle factors related to the collision, the rampage of the newspaper 10 to the top side edge or the ground side edge (for example, the top side edge and the ground side edge strongly collide on the center side, the reaction force, The phenomenon of unstable movement to the opposite center side) occurs, the tip of the paper flutters and bends as it is, is caught on the surface of the folding rollers 121 and 22 and is caught and passed through, so that the top edge and the ground side of the newspaper 10 Unnecessary folding occurs at the end.

There are four types of folds: peller-side folds, pella-side folds, pouch-side folds, and pouch-side folds, and the probability that the peller-side folds shown in FIG. Moreover, the places where the sky folding and the earth folding appear in the conventional folding machine 100 are the top side and the ground side both ends of the newspaper 10, and hardly occur at the center part.
In addition, although the peller side celestial fold shown in the figure (d) is diffracted twice, one fold and three or more folds (not shown) also occur.

As a technique for preventing the occurrence of the unnecessary folding, a technique for adjusting the shape and gap of the folding roller, a technique for adjusting the shape and position of the second folded newspaper guide, or the space 54 (the cross-sectional shape is Because it is almost a triangle, it is also called a delta zone.), A technique that intermittently or continuously blows air in the direction of pressing the top edge or the ground edge of the newspaper against the folding cylinder 41, a small brush or brush Various techniques such as a technique using a roll have been proposed.
For example, in Japanese Utility Model Publication No. 07-24368, at least one of a pair of folding rollers has a roller body and one end shaft of the roller body, which is formed to have the same diameter as the roller body and serves as a propeller side of the traveling paper passing therethrough. The technology of a folding roller for a folding device of a rotary press comprising a roller portion coaxially fitted to the portion and fitted to a roller main body so that the phase in the circumferential direction can be adjusted is disclosed.
No. 07-24368

  However, although the technique described in the utility model document 1 and various conventional techniques have been able to suppress the occurrence of folds, they cannot prevent the occurrence of unnecessary folds to a nearly complete level. There was a problem.

  In order to solve the above problems, an object of the present invention is to provide a folding machine of a rotary printing press capable of preventing the occurrence of folding to an almost complete level by paying attention to the generation mechanism of folding.

In order to achieve the above object, a folder of a rotary printing press according to the present invention is a folder of a rotary press provided with a pair of folding rollers for performing second folding of printing paper, at least a part of which is a folding cylinder. And a pair of folding rollers, and a leading end is provided with a folding prevention guide having a shape that smoothly guides the printing paper to the folding rollers.
In this way, a part provided in the space surrounded by the folding cylinder and the pair of folding rollers is the top side of the printing paper in the space surrounded by the folding cylinder and the pair of folding rollers. While taking up the space for bending the edge and the ground side edge, the leading edge can guide the printing paper to the pair of folding rollers, so that the top edge and the ground edge of the printing paper are violated ( Unstable behavior) and fluttering can effectively prevent the folding roller from being caught on the surface of the folding roller, and can surely prevent a celestial fold or a landslide.
The space surrounded by the folding cylinder and the pair of folding rollers refers to the surface of the folding cylinder, the surface of one folding roller, the surface of the other folding roller, the center of rotation of the folding cylinder, and one folding. A virtual plane including the rotation center of the roller, a rotation plane including the rotation center of the folding cylinder and the rotation center of the other folding roller, and a rotation center of one folding roller and the rotation center of the other folding roller. A space surrounded by an included virtual plane.

Further, in the rotary printer of the present invention, the folding prevention guide is provided at a position corresponding to at least one of the top edge and the ground edge on the bag binding side and the peller side of the printing paper. The configuration is as follows.
In this way, it is possible to effectively prevent the printing paper from being folded over and crushed.

Further, the folding machine of the rotary printing press according to the present invention has a configuration in which the folding prevention guide is supported so as to be adjustable in position.
In this way, the position of the folding prevention guide can be adjusted according to the number of printing papers, the printing speed, and the like, so that folding can be prevented more reliably.

Further, the folding machine of the rotary printing press according to the present invention is configured such that the folding prevention guide is supported in a state where a part of the folding prevention guide is accommodated in a groove formed in a circumferential direction of the folding roller. It is as.
If it does in this way, a breakage prevention guide can be thickened and mechanical strength can be raised. Moreover, the freedom degree of position adjustment of a bending prevention guide can be increased.

Further, in the folding machine of the rotary printing press according to the present invention, the folding prevention guide is made of resin or soft metal.
In this way, even when trouble such as a paper jam occurs, it is possible to prevent a problem such as damage to the folding roller. That is, even if the folding prevention guide is broken due to a paper jam and the broken piece is sandwiched between the folding rollers, damage to the folding roller or the like can be prevented.

Further, the folding machine of the rotary printing press according to the present invention is configured such that the folding prevention guide is supported so as to be able to advance and retreat, and includes a driving means for remotely operating the folding prevention guide.
In this way, the position of the folding prevention guide can be easily finely adjusted while operating the folding machine, or the set position can be set in advance by remote operation according to the number of newspaper pages.

  According to the rotary printer of the present invention, paying attention to the mechanism of occurrence of folding, by taking up the space for folding the top edge and ground edge of the printing paper, It can be prevented to a complete level.

[Embodiment]
1A and 1B are schematic views of a main part of a folding machine of a rotary printing press according to an embodiment of the present invention, where FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA.
In the figure, the folding machine 1 of the rotary printing machine is different from the folding machine 100 according to the conventional example in that a folding prevention guide 6 is provided. Other components are substantially the same as those of the conventional paper discharge device 100.
Accordingly, in FIGS. 1 and 2, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

(Folding prevention guide)
The folding prevention guide 6 has a rectangular bar shape whose top surface on the front end side is formed in a curved surface having a radius of curvature that is substantially the same as or slightly larger than the radius of the top folding roller 21, and the front end portion thereof is the newspaper 10. Is smoothly guided to the folding rollers 21 and 22.
In addition, at least a part of the breakage prevention guide 6 (in the present embodiment, the upper end on the front end side) is provided in a space 54 surrounded by the folding cylinder 41 and the pair of folding rollers 21 and 22 described above. Yes. The folding prevention guide 6 has a tip-side lower surface formed with a radius of curvature larger than the radius of the groove 211 formed in the circumferential direction of the top folding roller 21, and a part of the folding prevention guide 6 is formed in the groove 211. Supported in a contained state. If it does in this way, the breakage prevention guide 6 can be thickened and the mechanical strength of the breakage prevention guide 6 can be improved. The top folding roller 21 has a structure in which the groove 211 does not become too deep, and a reduction in mechanical strength of the top folding roller 21 is suppressed. In other words, the folding prevention guide 6 having excellent mechanical strength from the outside is installed in the space 54 having a limited gap due to the shape of the lower surface of the folding prevention guide 6 and the shape of the groove 211 of the top folding roller 21. can do.

By the way, the top side folding roller 21 is smaller than the other top side folding roller 121 (see FIG. 3). The difference is that a groove 211 having a shape in which the relief grooves 23 are communicated with each other, and the other structures are substantially the same. And with respect to the top folding roller 21, the folding prevention guide 6 has a structure in which a gap having the same width as the escape groove 23 is formed on both sides of the folding prevention guide 6 accommodated in the groove 211. Functions as a new escape groove. By doing so, the breakage preventing guide 6 can be provided in the vicinity of the two escape grooves 23 on the side of the peller formed at a narrower interval than the others without impairing the function of the escape grooves 23.
Further, by providing the top side folding roller 21 with the groove 211, the degree of freedom of position adjustment (for example, vertical position adjustment) of the folding prevention guide 6 can be increased.

  Further, the folding prevention guide 6 is provided in a state where the side surfaces are in contact with each other in the order of the top side guide 31, the bending prevention guide 6, the top side guide 31, and the top side guide 31 from the peller side. Thereby, the breakage preventing guide 6 is provided without substantially impairing the function of the three connected top side guides 31 on the peller side in the conventional example.

As described above, the folding prevention guide 6 of the present embodiment is provided at a position corresponding to the top end on the peller side of the newspaper 10 to be folded second. In general, the position corresponding to the top end on the peller side is a position slightly moved to the bag binding side from the position on the peller side end of the newspaper 10. This effectively prevents the occurrence of the most frequent peller side fold among the four types of unnecessary folds.
In the present embodiment, the folding prevention guide 6 is provided at a position corresponding to the top end of the newspaper 10 on the peller side where the folding of the newspaper 10 is most likely to occur. However, the present invention is not limited to this. It is not a thing. For example, a folding prevention guide (not shown) is also provided at a position corresponding to the top edge of the newspaper binding side on the bag binding side, a position corresponding to the ground edge on the bag binding side, and a position corresponding to the ground edge on the peller side. A structure may be provided. In this way, four types of folding of the newspaper 10 can be prevented.

  For example, although not shown, when the folding prevention guide 6 is provided at a position corresponding to the top end of the newspaper 10 on the bag binding side, it is provided between the first and second top guides 31 from the bag binding side. The folding prevention guide 6 is provided in a state where the side surfaces are in contact with each other. Further, with respect to the top folding roller 21, between the first and second escape grooves 23 from the bag binding side (without communicating with each escape groove 23, or with any one escape groove 23) By forming the groove 211 (in communication), the folding prevention guide 6 can be provided without impairing the functions of the top guide 31 and the escape groove 23 on the bag binding side.

  Further, the break prevention guide 6 is fixed to a support bar 311 to which the top guide 31 is fixed via a support member 61. This support member 61 has a structure in which a through-hole 611 to be fitted into the support bar 311 is formed and is divided into two from the end part toward the through-hole 611. By tightening the divided end part with a bolt 612, the support bar 311 is fixed. Further, the support member 61 has a structure in which the folding prevention guide 6 is screwed to the lower surface of the end portion on the top folding roller 21 side.

Here, it is preferable that the breakage prevention guide 6 is supported so as to be adjustable in position. In the present embodiment, when the support member 61 is fixed to the support bar 311, the fixing angle with respect to the support bar 311 can be adjusted. Therefore, the breakage prevention guide 6 is in a curved coordinate centered on the axis of the support bar 311. The position is adjusted in the circumferential direction. Further, when the breakage prevention guide 6 is screwed to the support member 61, although not shown in the figure, by forming an oval bolt hole in the breakage prevention guide 6, the position can be adjusted in the linear direction. That is, since the position of the breakage prevention guide 6 is adjusted in the circumferential direction and the radial direction with respect to the support bar 311, subtle and free position adjustment is possible. In this way, the position of the folding prevention guide 6 can be finely adjusted according to the number of newspapers 10, the printing speed, and the like, so that unnecessary folding can be prevented more reliably.
Note that the support structure of the breakage prevention guide 6 is not limited to the above structure.

The material of the break prevention guide 6 may be resin or soft metal. In this way, even when a trouble such as a paper jam occurs, it is possible to prevent such a problem that the folding rollers 21 and 22 are damaged. That is, even if the folding prevention guide 6 is broken due to a paper jam and the broken piece is sandwiched between the folding rollers 21 and 22, damage to the folding rollers 21 and 22 can be prevented.
Examples of the soft metal include aluminum, copper, tin, and alloys thereof. Further, the breakage prevention guide 6 may be a composite material such as a soft metal and Teflon (registered trademark).

Next, the operation of the folding machine 1 of the present embodiment and the detailed shape of the folding prevention guide 6 (according to the example) will be described with reference to the drawings.
FIG. 2 is a schematic view for explaining the operation of the folding machine of the rotary printing press according to the embodiment of the present invention, and (a) is an enlarged cross-section for explaining a state in which the second folding is performed. (B) is an enlarged cross-sectional view for explaining the state of the final stage of the second fold, and (c) is an enlarged cross-sectional view for explaining the state in which unnecessary folding is prevented. .
In FIG. 5A, when viewed from the side, the folding preventing guide 6 has an upper surface near the virtual plane 51 formed as a curved surface having the same radius of curvature as that of the top folding roller 21. That is, the distance (minimum distance) between the folding cylinder 41 and the folding prevention guide 6 is the same as the distance between the folding cylinder 41 and the top folding roller 21, and the newspaper 10 is fixed to the folding cylinder 41 by a paper pulling needle. When moving so as to wind around the drum 41, the newspaper 10 moves smoothly. Further, the newspaper 10 is secondly folded by being sent downward while being sandwiched between the top folding roller 21 and the ground folding roller 22.

  Further, in the bending prevention guide 6, the further distal end side of the curved surface protrudes outward (outside including the center side) from the curved surface having the same radius of curvature as that of the top folding roller 21. In other words, a part of the breakage prevention guide 6 has a structure that fills (occupies) the space in the space 54. Here, the ground side end of the newspaper 10 is pulled by the folding cylinder 41 in the rotation direction of the folding cylinder 41, and the top end is pushed by the folding cylinder 41, so that the pair of folding rollers 21, 22 The newspaper 10 before being sandwiched is gently bent (with a large radius of curvature) on the ground side, while being sharply (with a small radius of curvature) on the top side. For this reason, the protruding portion of the folding prevention guide 6 is brought closer to the top side folding paper 21 surface with respect to the top side newspaper 10 which is bent abruptly (with a small radius of curvature). In other words, the protruding portion of the folding prevention guide 6 exhibits an effect that the front side of the rear end of the newspaper 10 that starts to rampage does not contact the folding roller 21 in the space (delta zone) 54, and the newspaper 10 is smooth. Passes between the folding rollers 21 and 22.

  Next, as shown in FIG. 5B, when the second folding stage is entered, that is, in the space 54 surrounded by the folding cylinder 41 and the pair of folding rollers 21 and 22, the top of the newspaper 10 is placed. When the side end portion and the ground side end portion enter, the both end portions become completely free and move to the center side.

Next, both end portions moved to the center side collide and move to the anti-center side by the reaction force. However, as shown in FIG. When moved, the rear end portion of the newspaper 10 is blocked by the protruding portion of the folding prevention guide 6. As a result, the situation where the top edge of the newspaper 10 is brought into contact with the surface having increased frictional resistance due to the unevenness of the folding roller 21 and is unnecessarily folded by being caught is avoided, and the stretched state is smooth. Passes between the folding rollers 21 and 22. That is, since the protruding portion of the breakage prevention guide 6 is in the space 54, no space for bending is given to the top side end portion that moves to the anti-center side, and the top side end portion is the folding roller 21. This eliminates an element (trigger) in which an unnecessary fold occurs and the newspaper 10 inevitably cannot be folded, and the folding machine 1 is effective in generating an unnecessary fold. And almost completely prevented.
Further, the tip of the folding preventing guide 6 has a gentle curved surface that overlaps the surface of the top folding roller 21 from the protruding portion, and the protruding portion has lost the trigger of the folding (that is, has stretched). The newspaper 10 (in a state) is smoothly guided to the folding rollers 21 and 22, and unnecessary folding is avoided.

Thus, according to the folding machine 1 of this embodiment, paying attention to the generation mechanism of an unnecessary fold, by providing the fold prevention guide 6 so as not to give a space for bending, generation of an unnecessary fold is prevented. It can be effectively and almost completely prevented.
In general, the shape of the guide portion on the front end side of the folding prevention guide 6 depends on the rigidity of the newspaper 10, the material related to the habit, the printing state related to the ink amount and the dampening water amount, the number of pages of the newspaper, and the like. Subtle corrections are made.

As mentioned above, although the preferable embodiment was shown and demonstrated about the folding machine of the rotary printing machine of this invention, the folding machine of the rotary printing machine which concerns on this invention is not limited only to embodiment mentioned above, This invention It goes without saying that various modifications can be made within the range described above.
For example, the folding machine 1 of the rotary printing press has a configuration in which the folding prevention guide 6 is fixed to the support bar 311 via the support member 61 so as to be adjustable in position, but is not limited thereto. For example, although not shown, the folding prevention guide 6 may be supported by a linear bearing or the like so as to be able to advance and retreat and be remotely operated by a driving means such as a ball screw, a rack, or a motor. In this way, the position of the folding prevention guide 6 can be easily fine-adjusted while operating the folding machine 1, or the set position can be set in advance by remote operation according to the number of newspaper pages.

  The present invention is applicable to a folding machine that folds in half from the center of the printing paper.

It is the schematic of the principal part of the folding machine of the rotary printing press concerning one Embodiment of this invention, (a) is a top view, (b) has shown AA sectional drawing. It is the schematic for demonstrating operation | movement of the folding machine of the rotary printing press concerning one Embodiment of this invention, (a) is an expanded sectional view for demonstrating the state in which the 2nd folding is performed, ( (b) is an enlarged cross-sectional view for explaining the state of the final stage of the second folding, and (c) is an enlarged cross-sectional view for explaining a state in which the occurrence of unnecessary folding is prevented. It is the schematic of the principal part of the folding machine of the rotary printing press concerning a prior art example, (a) is a top view, (b) shows the BB sectional drawing for demonstrating the state in which 2nd folding is performed. ing. It is the schematic for demonstrating the unnecessary folding by the folding machine of the rotary printing press concerning a prior art example, (a) is an expanded sectional view for demonstrating the state in which 2nd folding is performed, (b). Is an enlarged cross-sectional view for explaining the state of the final stage of the second fold, (c) is an enlarged cross-sectional view for explaining a state in which unnecessary folding has occurred, and (d) is in which unnecessary folding has occurred. 1 shows a perspective view of a newspaper.

Explanation of symbols

1,100 Folding machine 6 Folding prevention guide 10 Newspaper 21, 121 Top side folding roller 22 Ground side folding roller 23 Escape groove 31 Top side guide 32 Ground side guide 41 Folding cylinder 42 Folding blade 51 Virtual plane 52 Virtual plane 53 Virtual Plane 54 Space 61 Support member 211 Groove 311 Support bar 611 Through hole 612 Bolt

Claims (6)

In a rotary press folding machine having a pair of folding rollers for performing second folding of printing paper,
At least a part is provided in a space surrounded by a folding cylinder and a pair of folding rollers, and a leading end includes a folding prevention guide having a shape that smoothly guides the printing paper to the folding rollers. A rotary printer folding machine.   2. The rotary according to claim 1, wherein the folding prevention guide is provided at a position corresponding to at least one of a top edge portion and a ground edge portion on the bag binding side and peller side of the printing paper. Printing machine folding machine.   The folding machine for a rotary printing press according to claim 1 or 2, wherein the folding prevention guide is supported so as to be adjustable in position.   The said folding prevention guide was supported in the state formed in the groove | channel formed in the circumferential direction of the said folding roller in the state in which a part of this folding prevention guide was accommodated. A rotary press of the rotary printing machine according to item.   The folding machine for a rotary printing press according to any one of claims 1 to 4, wherein the folding prevention guide is made of a resin or a soft metal.   The rotary printing press according to any one of claims 1 to 5, wherein the folding prevention guide is supported so as to be movable back and forth, and includes a driving unit for remotely operating the folding prevention guide. Folding machine.

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