JP2003238028A - Folding part guide device of printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding part guide device of a printer capable of preventing generation of a poorly yielded sheet such as end fold, wrinkle, etc., when folded leaves are to be prepared. <P>SOLUTION: Air nozzles 10a and 10b are arranged in rows between a pair of fold-in rollers 1a and 1b, and to its over-part, air is blown to suppress an end folding behavior of each folded leaf 6 depending upon the operation speed or a change of the number of leaves. A plurality of grooves extending in the circumferential direction at a certain spacing are provided in the air nozzle installing part of the roller 1a so that the air nozzles 10a and 10b do not touch the rollers 1a and 1b or the folded leaf 6 passing. A plurality of guide blow pipes 11 in rows are arranged at the side behind a web (6), and the air is blown to the folded leaf (web) 6 running by a guide 8 on the side with a saw drum 4 of the roller 1a. Accordingly the end of each folded leaf is prevented from flowing to the right by giving a running resistance, which can decrease occurrence of end folding. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding portion guide device for a printing machine, which is provided with a folding portion guide suitable for high-speed operation in, for example, a rotary press.

[0002]

2. Description of the Related Art As shown in FIG. 16, an offset rotary press for newspapers includes a sheet feeding device, a printing device and a folding device 2, which are not shown.
The folding machine 2 is composed of a paper discharge device 16 for carrying out the signature 6 processed and formed to the outside. By the way, the folding machine 2 and the paper discharge device 16 are configured as shown in the figure, and the web 3 after printing is continuously conveyed from the printing device side in the previous step and guided by the drag roller 17. The triangular plate 18 provided at the entrance of the folding machine 2 folds the sheet in two in the longitudinal direction (sheet traveling direction). Next, after being nipped by the lead-in rollers 19a and 19b and the nipping rollers 20a and 20b arranged below and rotatably transferred, it is fed between the saw cylinder 4 and the folding cylinder 5.

As shown in FIG. 17, on the outer peripheral surface of the saw barrel 4, a pair of saw blades 21 having saw blades 22 are provided along the axial direction. The folding cylinder 5 has a pair of saw blade receivers 23 formed of an elastic material such as rubber along the axial direction as a receiving member for the saw blades 22, and a needle for piercing the leading end of the web 3 to convey the web 3. 24 and a folding blade 25 for folding the web 3 cut by the saw blade 22 near the center in the traveling direction. The saw body 4 illustrated in FIG.
Further, the folding cylinder 5 has a phase set so that the saw blade 22 and the saw blade receiver 23 mesh with each other, and is configured to rotate in opposition in synchronization. The needle 24 of the folding cylinder 5 is attached to the end of the needle arm assembled to the needle shaft so that the needle 24 appears and disappears from the outer peripheral surface of the folding cylinder 5 at a predetermined phase position as the folding cylinder 5 rotates. Has become. That is, the needle 24 has the folding cylinder 5 at a position before the web 3 is cut in the width direction by the saw blade 22 and the saw blade receiver 23.
Jump out of the surface of the
Is rotatably transferred along the outer peripheral surface of the folding cylinder 5.

Due to the rotational movement of the web 3, the center portion of the leading end of the web 3 and the next cutting position is folded into the folding roller 1.
The needles 24 enter and come off the web 3 when approaching the positions directly above a and 1b. Then, the web 3 is pushed into the intermediate engaging portion of the folding rollers 1a, 1b by the action of the folding blade 25, and the web 3 is cut at the next cutting position. The folding blade 25 is fixed to a folding shaft incorporated in the folding cylinder 5, and interlocks with the rotation of the folding cylinder 5 to move in and out of the cylindrical surface of the folding cylinder 5 at a predetermined phase position. In this way, the folding blade 25 functions to push the web 3 wound around the folding cylinder 5 directly below the folding cylinder 5 into the folding roller portion and to fold the web 3 in the center. The folding roller portion is composed of two sets of rollers 1a and 1b, and rotates relative to the folding cylinder 5 via a drive gear train 28 such as a drive gear of the folding cylinder 5, an intermediate gear, and a gear for the folding roller. Being driven.

The web 3 pressed by the folding blades 25 just below the folding cylinder 5 is nipped by the folding rollers 1a and 1b, folded laterally at right angles to the web flow direction, and then used as a folding booklet 6 as a downstream impeller. 7 (see FIG. 16). The impeller 7 is a device for receiving the signatures 6 transferred via the folding rollers 1a and 1b and arranging them on the paper discharge conveyor 26 at a predetermined pitch.

[0006]

By the way, as shown in FIGS. 17 to 18, the leading end of the web 3 transferred by the needle 24 is once released from the needle 24 after passing through the upper portions of the folding rollers 1a, 1b. However, due to the fact that it is pushed in from the center by the folding blade, it is pulled back toward the folding rollers 1a, 1b, and there is a tendency for flapping to occur at the edges of the sheet that can move freely. For this reason, the folding 6 may be rolled up as it is in a folded state or a wrinkled state, may be pinched between the folding rollers 1a and 1b, and may be discharged as a folded signature 6 having end folds or wrinkles.

On the contrary, since the rear end of the web 3 moves in the same direction as the rotation of the outer circumference of the folding cylinder, the inertia and the folding of the web 3 are increased before the free rear end passes through the folding rollers 1a and 1b. The air flow caused by the rotation of the body 5 and the folding rollers 1a and 1b is apt to flow to the right side in FIG. Therefore,
The rear end of the web 3 passes between the folding rollers 1a and 1b in a folded state as shown by a broken line in FIG.
Edge breakage is easy to occur. Such edge folds occur more frequently as the printing speed increases, but since they also change depending on the construction page and paper type, to avoid edge folds,
For example, the method of adjusting the gap d between the guides 8 and 9 on both sides of the folding roller is not perfect, and as a result, a large number of signatures (broken paper) with end folding may be generated. For this reason, when it is empirically determined that edge breakage is likely to occur, the normal printing operation speed is often set to a low value, and production efficiency must be reduced. The above problem is not only in the newspaper rotary press, but also in the folding rollers 1a and 1b which cooperate with the folding cylinders 5 of the folding machines 2 of various types used in the rotary press to form a folded sheet. Conventionally, various tip-shaped products of the guides 8 and 9 have also been applied, but this has not been a fundamental solution.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a fold guide device for a printing press capable of preventing the generation of defective paper such as edge folds and wrinkles when creating a signature. To do.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a folding device, such as a rotary press, which cooperates with a folding cylinder to create a signature. One of the folding rollers is located near one of the folding rollers. The folding part guide device is characterized in that air nozzles are provided on both sides and air is ejected upward. Further, according to the present invention, an air nozzle is disposed in the guide portion near the folding roller to inject air by inclining in a direction opposite to the direction of transport of the signature, and resistance is given to the trailing edge of the signature sandwiched and transported by the folding roller. It is a folding part guide device characterized in that it is configured to. Further, the present invention relates to a folding device that cooperates with a folding cylinder to create a folded sheet, in which an air nozzle pipe is arranged from an upper portion of a folding roller to a sandwiching portion, and the tip end portion of the pipe extends substantially upward. A fold portion characterized by being provided with an aperture nozzle, configured to eject air in a direction opposite to the direction of transport of the signature and to apply resistance to the rear end of the signature before being nipped and transported by the folding rollers. It is a guide device. Further, the present invention relates to a folding device that cooperates with a folding cylinder to create a folded sheet, in which an air nozzle pipe is arranged from an upper portion of a folding roller to a sandwiching portion, and the tip end portion of the pipe extends substantially upward. A fold portion characterized by being provided with an aperture nozzle, configured to eject air in a direction opposite to the direction of transport of the signature and to apply resistance to the rear end of the signature before being nipped and transported by the folding rollers. It is a guide device.

Further, according to the present invention, a suction box is arranged in the guide portion near the folding roller, and the traveling signature is attracted to the guide surface by suction, and the trailing edge of the signature is pinched and transported by the folding roller. A folding part guide device characterized by being configured to impart resistance. In the case of this folding part guide device, it relates to a folding device in a folding machine such as a rotary press that creates a signature in cooperation with a folding cylinder. By doing so, the traveling signature can be attracted to the guide surface, and the suction box near the folding roller can be configured to apply resistance to the trailing edge of the signature that is nipped and transferred. As described above, in the present invention, the end folding behavior when forming a signature with the folding rollers is suppressed by sucking or ejecting air.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a folding portion guide device for a printing machine according to the present invention will be described with reference to the drawings. 1 to 4, the second embodiment to FIGS. 5 to 8, the third embodiment to FIGS. 9 to 10, and the fourth embodiment to FIGS. 11 to 12. The fifth
The respective embodiments are shown in FIGS. 13 to 15, respectively. The same reference numerals are used for the same members as conventional ones, and the description thereof will be omitted below.

As shown in FIG. 1, in the first embodiment,
During the printing operation, a pair of folding rollers 1 is provided to prevent abnormal folding (edge folding) at the rear end of the signature when passing through the folding rollers.
A plurality of air nozzles 10a and 10b are arranged between a and 1b, and air is blown upward. The ejection ports of the air nozzles 10a and 10b face the folding cylinder 5. Figure 2
As shown in FIG. 3, the air nozzle installation portion of the folding roller 1a is provided with a plurality of circumferentially extending grooves at predetermined intervals, and the nozzles 10 do not come into contact with the folding rollers 1a, 1b and the passing signature 6 by the grooves. It is like this. In addition,
Air nozzles 10a, 1 are provided on both sides of the folding rollers 1a, 1b.
Although 0b is arranged, only one of them may be arranged depending on the actual driving situation. The air blow amount is adjusted to a necessary appropriate amount or pressure according to the operating conditions, but since the air flow above each of the left and right folding rollers 1a and 1b is different, the appropriate amount or pressure is also different between the left and right.

As shown in FIGS. 3 (a) and 3 (b),
An air nozzle 10c having a shape in which the pipe tip has an oblique cut surface 10d may be used. Further, as shown in FIGS. 4A to 4C, the air nozzle 10e has an elliptical shape or an elongated hole shape. May be used. With such a shape, air can be jetted over a wide area in the width direction of the trailing edge of the signature that passes through. As another shape of the air nozzle, a separately manufactured nozzle may be attached and fixed to the pipe.

As shown in FIG. 1, guide blow tubes (air nozzles) 11 are arranged in multiple rows on the lower saw cylinder 4 side of the folding cylinder 5, that is, on the rear end side of the web 6, and the folding rollers 1a are guided on the saw cylinder 4 side. In the 8th section, the running signature (web) 6 is blown with air to impart running resistance, thereby preventing the flow of the edge of the signature shown in FIG. 1 to the right side and reducing the edge folding. There is. The guide blow pipe 11 can be used as a substitute for the air nozzles 10a and 10b. In addition, the guide blow pipe 11 includes the air nozzles 10a and 1a.
0b may be used together, and can be omitted depending on the usage.

The air nozzle 10 is constructed as described above, and its function and effect will be described. The signature 6 folded after being cut by the saw cylinder 4 and the folding cylinder 5 is nipped and transported by the folding rollers 1a and 1b, and the impeller 7
(See FIG. 16). At this time, an air flow is generated around the upper part of the folding rollers 1a and 1b by the folding cylinder 5 and the folding rollers 1a and 1b, and when the signature passes there, it is affected by the air flow. In order that the folding rollers 1a and 1b have a function of nipping and transporting the signature 6, the roller surface is generally subjected to corrugated serration processing, and is rotated faster than the surface speed of the folding cylinder 5. Therefore, the degree of influence of the air flow is large, and abnormal folding of the rear end portion occurs when the signature is passed. In such a situation, in the present embodiment, the operating condition changes,
In particular, in order to suppress the end bending behavior of the tension 6 due to changes in operating speed and construction pages, an air blow is arranged and configured.
It has the following effects. (1) Corresponding to printing operation speed, construction page or paper quality,
The amount of air blow and the pressure can be adjusted to create an optimal situation that suppresses edge breakage. (2) The adjustment in (1) above can be preset according to the operating conditions, the folding quality is reliably stabilized, and high-speed operation is also possible. Therefore, productivity can be significantly improved.

In the second embodiment, as shown in FIG.
A plurality of rows of air nozzles 40a and 40b are arranged between the pair of folding rollers 1a and 1b in order to prevent end folding that occurs when passing through the folding rollers 1a and 1b during the printing operation, and air is blown upward. is doing. As shown in FIG. 7, the tip walls 37 of the air nozzles 40a and 40b are not perforated. As shown in FIG. 6, the folding rollers 1a,
A groove 32 is provided in the circumferential direction of 1b so that the nozzle 10 does not come into contact with the folding rollers 1a, 1b and the passing signature 6. As shown in FIG. 5, the folding rollers 1 on both sides
Air nozzles 40a and 40b are wound around the a and 1b from the upper side. Each of the air nozzles 40a and 40b is connected to the air headers 30a and 30b, and from the air headers 30a and 30b to a compressor (pump) (not shown) which is an air supply source via a control valve 13 (see FIG. 11) and a regulator. It is connected.

During the printing operation, the air flow above the left and right folding rollers 1a and 1b fluctuates depending on the conditions, so that the influence on the folding of the signature ends also changes. Therefore, it is necessary to adjust the air blow amount and the air pressure individually to the right and left sides and adjust them to appropriate amounts or pressures. As an applied structure example, a folding roller 1
air nozzles 40a, 40 arranged in parallel in the axial direction of a, 1b
The air blow amount and the air pressure of b may be divided into a plurality of parts or may be set independently.

FIG. 7 shows an example of the shape of a hole (air blowout hole or blow hole) 31 formed at the tip of the air nozzle. FIG. 8A shows a hole (circular shape) close to the tip of the pipe. ), (B) in the figure is formed in an elliptical shape, and (c) in the figure is formed in a long hole shape. The holes 31 may have various shapes other than those exemplified above. Each of these holes 31 functions so as to spread over the wide area in the axial direction of the folding rollers 1a and 1b with respect to the rear end portion of the folding booklet 6 passing therethrough.

The air nozzles 40a and 40b are constructed as described above, and in addition to the effect of the first embodiment, the air nozzle 10 is arranged by winding in the same direction as the rotation direction of the folding rollers 1a and 1b. Therefore, problems such as paper jams are eliminated. That is, in the case of the first embodiment, the air nozzle 10 is arranged in the direction opposite to the rotation direction of the folding rollers 1a and 1b, and the following problems may occur. (1) When the pair of folding rollers 1a, 1b move to the left and right and escape in the direction in which the gap between the rollers is opened, the tip of the air nozzle 10 is projected inward from the roller surface, and the signature 6
There is a risk that it will get scratched as it is caught. If it becomes severe, paper jam may occur and the air nozzle 10 may be damaged. (2) Under the above structure, if the direction of the blow pipe (air nozzle 10) and the amount of protrusion are adjusted, the above problem occurs even with a slight protrusion due to the position movement, making it difficult to perform delicate adjustment.

On the other hand, in the second embodiment, in order to improve the guide device for the signature 6, which is configured to cope with the problem that the defective paper (folder) such as the end folds and wrinkles occurs as described above. In addition to the effects of the first embodiment, it has the following effects. (1) Since the air nozzle 10 is wound and arranged in the same direction as the rotation direction of the folding rollers 1a and 1b, problems such as paper jam can be eliminated. (2) By changing the margin and position of the blow tube 10, it is possible to easily adjust the change of the air blowing direction and position according to the printing operation speed, page construction, paper quality, etc. It is possible to create the optimum situation to do. (3) It is also possible to preset the above adjustments according to the operating conditions, so that the folding quality is reliably stabilized and high-speed operation is possible. Therefore, productivity can be significantly improved.

In the third embodiment, as shown in FIG.
An air guide that uses the signature guide at the bottom of the folding roller is newly added. That is, in the example shown in FIG. 9, a nozzle hole 34 is bored in the folding guide 36 installed below the one-side folding roller 1a located on the saw cylinder 4 side so as to blow air obliquely upward between the pair of folding rollers 1a and 1b. is doing. As shown in FIG. 10, the signature guides 36 are arranged in a plurality of rows in the axial direction of the folding rollers, and the grooves 32 are provided at the corresponding portions of the folding rollers so as not to come into contact with the signature guides. The signature guide 36 is attached to the beam 35 that extends in the axial direction of the folding roller. Nozzle hole 34
Is an air nozzle 38, an air header 30, a control valve 13,
It is connected to a compressor (pump) that is an air supply source via a regulator or the like. The air blow amount and the air pressure can be adjusted to a necessary and appropriate amount or pressure according to operating conditions. Also, as in the second embodiment,
The air blow amount and the air pressure of the air nozzles 38 arranged side by side in the axial direction may be set separately or independently.

The air nozzle 38 is constructed as described above, and in addition to the effect of the first embodiment, it is possible to suppress edge breakage to enable high speed operation, and also to hold and transport signatures. The effect of alleviating the contact with the signature guide 36 and smoothly transferring to the impeller even at high speed operation can be obtained.

In the fourth embodiment, as shown in FIG. 11, the guide portion around the folding cylinder 5 and on the side of the lower saw cylinder 4 is a suction guide 12 having a suction box structure, and the signature is attracted to the guide surface. ing. Suction guide 12
The suction box is connected to a vacuum generator (not shown) such as a suction pump by a suction pipe. By installing the control valves 13a and 13b in this piping line and controlling them, it is possible to adjust the suction amount and the suction force according to the change in the operating conditions, as in the case of the first embodiment. . This suction guide 12 can freely set the suction box width and the length in the circumferential direction of the folding cylinder. However, suction in the vicinity of the folding roller is performed for the purpose of regulating the flow and abnormal behavior of the trailing end of the folded sheet above the folding roller. is important. Various types of suction holes may be arranged, such as a method in which the guide length is divided into a plurality of rows and the diameter and number of the suction holes are changed, or a suction box is provided only in the vicinity of the folding roller to form several rows of suction holes. As the suction hole processing array, the staggered array shown in FIG. Further, the suction guide 12 can also be applied to the right guide 9 of the folding roller, whereby it is possible to obtain the effect of restricting fluttering at the trailing end of the signature and reducing end folding.

The suction guide 12 attracts the web (folder), especially the rear end portion when passing through the folding rollers,
In addition to reducing the inertial flow at the trailing end of the folded sheet, the air flow around the folding rollers is also reduced, so that bending and folding are prevented, and the air flows between the folding rollers in a straight line. Therefore, in addition to the effects of the first embodiment, the following effects are obtained. (1) It is possible to effectively control the trailing edge of the signature in response to changes in various operating conditions and prevent the occurrence of defective paper such as edge folding. Therefore, the work load of the operator such as sheet inspection at the time of printing is reduced. (2) Similar to the first embodiment, the suction amount or the suction force can be preset in accordance with the page length and the operating speed, and even an inexperienced operator can easily perform the printing operation under the optimum conditions and improve the efficiency. Can be further promoted. (3) By facilitating the correction of the preset data in (2) above, it is possible to always operate with the latest data, and therefore a more stable signature can be formed and discharged.

In the fifth embodiment, as shown in FIG. 13, the air box 27 is used in combination with the suction box in the fourth embodiment. The folding roller side is used as a suction box. As shown in FIGS. 14 to 15, the nozzle portion of the air box is a so-called Bernoulli jet type air box that generates an air jet parallel to the surface of the air box. With this Bernoulli jet, the signature web 3 which is a flexible flat body traveling on the surface can be evenly sucked. That is, the signature web 3, which is wound around the outer periphery of the folding cylinder and travels, is sucked toward the guide side and sucked at the suction box portion. The length of the suction box may be in a narrow range near the folding roller due to the addition of the air box function, and the same function as that of the fourth embodiment for adsorbing the trailing end of the signature can be exhibited.

The air box 27 has a fourth function including a point that the folding box is prevented from bending and folding by adsorbing the trailing end of the signature when passing through the folding rollers, and acts so as to pass straight between the folding rollers. It has the same effect as the embodiment, but additionally has the following effect. (1) Since the effect of adjusting the air volume and suction air volume can be controlled more stably and clearly than in the fourth embodiment, the occurrence of defective paper such as edge folding can be ensured against changes in various operating conditions. It can be prevented. Therefore, it is possible to reduce the operator's work load such as paper inspection during printing.

[0027]

As described above, according to the present invention, the air nozzle for ejecting the air upward is arranged on either one or both of the pair of folding rollers for forming the signature by cooperating with the folding cylinder.
It is possible to prevent the generation of defective paper such as edge folds and wrinkles when creating a signature.

[Brief description of drawings]

FIG. 1 is a front view showing, in a partially enlarged manner, a state in which a folding unit guide apparatus for a printing press according to a first embodiment of the present invention is installed in a folding machine for a rotary press. is there.

FIG. 2 is a plan view of a guide and a guide blow tube, which are not shown in the drawing, taken along an arrow II in FIG.

3A is a plan view showing an example of the shape of the tip of the air nozzle of FIG. 1, and FIG. 3B is a front view thereof.

4 (a) is a plan view showing an example of the tip shape of the air nozzle of FIG. 1, (b) is a front view thereof, and (c) is a right side view thereof.

FIG. 5 is a front view showing, in a partially enlarged manner, a state in which a folding unit guide device for a printing press according to a second embodiment of the present invention is installed in a folding machine of a rotary press. is there.

FIG. 6 is a plan view of the guide and the guide blow tube taken along the arrow VI in FIG.

FIG. 7 is an enlarged view of part VII of FIG.

8 is a plan view showing the shape of an air blowout hole formed at the tip of the air nozzle, as shown by arrow VIII in FIG.
If (a) is a perfect circle, (b) is an ellipse, (c)
Shows the case of a long hole.

FIG. 9 is a front view showing, in a partially enlarged manner, a state in which a folding unit guide device for a printing press according to a third embodiment of the present invention is installed in a folding machine of a rotary press. is there.

FIG. 10 is a plan view of the guide and the guide blow tube taken along the arrow X in FIG.

FIG. 11 is a front view showing, in a partially enlarged manner, a state in which a folding unit guide device for a printing press according to a fourth embodiment of the present invention is installed in a folding machine of a rotary press. is there.

12 is a plan view of the suction guide taken along the arrow XII in FIG.

FIG. 13 is a front view showing, in a partially enlarged manner, a state in which a folding unit guide device for a printing press according to a fifth embodiment of the present invention is installed in a folding machine of a rotary printing press; is there.

FIG. 14 is a plan view showing an enlarged shape of a nozzle portion provided in an air box along arrow XIV in FIG. 13 and showing a Bernoulli jet flow by an arrow.

15 is a sectional view taken along the arrow XV in FIG.

FIG. 16 is a front view showing a schematic configuration of a folder and a sheet discharging device in a general rotary press.

FIG. 17 is an enlarged front view showing the folding machine of FIG. 16 in more detail.

FIG. 18 is a front view showing the folding section guide device of FIG.

[Explanation of symbols]

1a, 1b Folding roller 2 folding machine 3 Web (folder) 4 saw body 5 folding cylinder 6 signatures 7 impeller 8, 9 guide 10a, 10b, 38, 40a, 40b Air nozzle 11 Guide blow tube 12 Suction guide 13 Control valve 16 Paper ejection device 17 Drag roller 18 triangular plate 19 Lead-in roller 20 nipping roller 21 Saw stand 22 saw blade 23 saw blade receiver 24 needles 25 folding blades 26 Paper discharge conveyor 27 Air Box 28 Drive gear 30a, 30b Air header 31, 31a, 31b, 31c holes 32 grooves 34 nozzle holes 35 beams 36 Origami Guide 37 Tip wall

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Omeki             Hiroshima Prefecture Mihara City Itozakicho 5007 Mitsubishi Heavy Industries             Paper and printing machinery division (72) Inventor Masataka Hirota             20-24 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture               Ryomei Giken Co., Ltd. F term (reference) 3F108 AA01 AB02 AC04 BA03 BB32                       BB33 CC13 CC16 CC33 CC47                       CC49

Claims (6)

[Claims] 1. A printing press, characterized in that an air nozzle for ejecting air upward is provided on one or both of a pair of folding rollers for forming a signature in cooperation with a folding cylinder. Folding part guide device. 2. An air nozzle is arranged in a guide portion near a folding roller that cooperates with a folding cylinder to create a signature, and air is ejected in a direction opposite to the direction in which the signature is transferred to resist the rear end of the signature. A folding part guide device for a printing machine, which is characterized in that: 3. An air nozzle pipe is provided from an upper portion of a folding roller for making a signature in cooperation with a folding cylinder to a sandwiching portion, and an opening nozzle that is directed substantially upward is provided at a tip portion of the pipe. A folding part guide device for a printing press, characterized in that air is ejected in a direction opposite to a direction in which a signature is transferred, and resistance is applied to a rear end of the signature before being nipped and transferred by a folding roller. 4. A guide for guiding the signature to the impeller is provided in the vicinity of the sandwiching portion of the folding roller that cooperates with the folding cylinder to create the signature, and the signature is provided at the upper end of the guide. A folding part guide device for a printing press, characterized in that air is ejected in a direction opposite to a transfer direction so that resistance is applied to a rear end of a signature before being nipped and transferred by a folding roller. 5. A suction box is provided in a guide portion near a folding roller that cooperates with a folding cylinder to create a signature, and a traveling signature is attracted to a guide surface by suction to a trailing end of the signature. A folding guide device for a printing press, which is characterized by imparting resistance. 6. The air box for arranging the trailing end of the signature, which is attracted to the guide surface, toward the guide surface by a Bernoulli jet, is arranged in the guide portion. Folding part guide device for the printing machine described.