JPH06219081A - Method of reinforcing thin film and device performing that method - Google Patents

Abstract

PURPOSE:To perform at a high speed and precisely folding operation of a thin film by applying temporarily deformation strengthening physical strength of the thin film such as India paper for a dictionary to the thin film. CONSTITUTION:In printing paper P of a thin film which has been advanced away in the direction A, a guide member contacting part is lowered along a form of the guide member 3 through the guide members 3 each arranged between supporting members 2 and a part other than that moves on the surface of the supporting member 2 through the supporting member 2. Consequently, at a point of time when the tip part P1 collides with a patch 1, a deformation of a corrugated form is applied to printing paper forcibly or temporarily so that a wave crest part and wave trough part run parallel with the direction A of movement of the printing paper P in a widthwise direction of the printing paper by the guide member 3 and supporting member 2. In the printing paper P, physical strength is increased temporarily by the deformation of the wave form and the tip P1 of the printing paper collides with the patch 1, through which slackening which has been generated conventionally can be prevented and folding operation of the printing paper P can be performed precisely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a thin film and an apparatus for carrying out the method, and more particularly to accurately folding a printing paper in a step of binding a book using a thin paper such as a dictionary. The present invention relates to a method and an apparatus for temporarily increasing the physical strength of a thin film such as a printing paper so as to be able to perform.

[0002]

2. Description of the Related Art As one of the bookbinding processes, there is a process of forming a signature of a continuous page, that is, a folding process, by folding a printing paper, which is a sheet having a plurality of pages printed on the front and back sides, a predetermined number of times. . For example, thin paper (indian paper) used for a dictionary or the like has a large number of folds.
Often, 16 folds are made to form 6 or 32 pages of signatures.

FIG. 7 shows a method of forming a signature by mechanical folding using a knife type folding machine. The printing paper 50 in the figure is transported from the left side of the figure in the direction A, and the leading edge of the sheet 50 is applied to the backing plate 51.
Hit against. In this state, the knife type metal piece (hereinafter referred to as “knife”) 56 is lowered to push down the printing paper 50 located below, and the pushed printing paper 50 is lowered by the guide rolls 52a and 52b, and further pressed to the press contact roll 53. It is pressed against the transfer belt 54 and bent. In this case, since the distance L between the backing plate 51 and the knife 56 is set so that the lower position of the knife 56 is located at the center of the printing paper 50, the printing paper 50 is folded in half and the first Is folded (large fold). Further, the photographic printing paper 50 after the large fold, which is transferred by another transfer belt 55 arranged so as to be orthogonal to the transfer belt 54, is further halved by forming a folded portion orthogonal to the folded portion of the large fold. Can be folded into By repeating this operation, the printing paper is folded up to a preset number of folds such as 4-fold, 8-fold, 16-fold, etc., and a signature is formed.

[0004]

For example, in the case where the B5 version of the printing paper for books is printed as a 32 page fold,
The printing paper 50 is a large sheet having a width of 70 cm or more and a length of 100 cm or more. It is known that when such a large piece of printing paper is largely folded in the folding step, the folds often deviate from the center of the printing paper 50. When misalignment occurs in the stage of large folding in this way, even if the subsequent folding process is accurate, the finished signature is not correctly folded, so the printing surface of each page may be displaced from the page stop. Occurs.

In the large folding deviation as described above, the front end edge portion 50a of the printing paper 50 collides with the backing plate 51 by feeding the printing paper at a high speed, and the inertia of the collision causes slack in the printing paper. The length of the printing paper from the backing plate 51 to the knife 56 is L set in advance (distance half the length of the printing paper 50)
It is slightly longer than that, and as a result, the contact portion of the knife 56 is displaced from the center of the printing paper 50. Therefore, in order to accurately fold the printing paper 50 into large folds, it is necessary to prevent the slack from occurring by lowering the feeding speed of the printing paper 50, but it is natural that the feeding speed of the printing paper 50 is reduced. However, the folding time will be extended. Therefore, conventionally, the feeding speed of the printing paper 50 is determined by weighing the folding accuracy and the folding speed.

The slack mentioned above was conventionally thought to occur on most of the printing paper, but in any case, since the folding machine operates at a considerably high speed, the leading end portion 50a of the printing paper 50 is Immediately after hitting the backing plate 51, the knife 56
Is activated and the same printing paper 50 is returned to the knife 56 side. For this reason, the slack of the printing paper 50 disappears in an instant, and the slack generation time is an extremely short time of a few seconds or a tenth of a second, and the slack state is visually observed. It was impossible. Further, in the industry, when thin paper such as Indian paper is used as a large printing paper, it is inevitable that slack will occur, and there was no intention to deliberately check the state of slack. Because of such a state, there is no particular scientific basis, and the state of occurrence of slack was thought to be the occurrence of the entire printing paper as described above.

Here, the inventors of the present invention filed another application (Japanese Patent Application No. 4-
1974), larger printing papers (eg 6
By separately forming a four-page fold, a technique for reducing the number of signatures in one book and simplifying the bookbinding process is separately proposed. In this case, the size of the printing paper is increased, so that the misalignment is more likely to occur, and since the number of folds is increased, the influence of the misalignment becomes more serious. Therefore, in order to study measures to prevent misalignment, we decided to first observe what the actual state of slack in the printing paper was like.

Specifically, a television camera is arranged at a position where the whole of the printing paper can be overlooked, the printing paper is photographed by this camera, and the recorded image is analyzed to observe the occurrence of slack. did. 8 and 9 show the actual situation of occurrence of slack found by the image analysis. As is clear from the figure, the slack does not occur on the entire printing paper 50 as conventionally believed, but rather on the front edge 5 of the printing paper, which is the portion that collides with the backing plate 51.
The leading edge is 0a, which is concentrated in an extremely small portion in the length direction of the printing paper, and the occurrence of slack in the other portions is not observed at all (reference numeral 5 in FIGS. 8 and 9).
0b indicates this slack). As expected, the slack 50b has a corrugated shape in which the corrugated head and the corrugated bottom are continuous in the width direction of the printing paper 50, that is, the corrugated head and corrugated bottom are connected to each other by printing. It was confirmed that the paper 50 was formed so as to be substantially orthogonal to the traveling direction A of the paper 50. Further, the slack was partially generated because the thickness of the printing paper 50 was thin and the leading end edge 50a was small.
When the paper collides with the backing plate 51, the slack 50b generated around the tip end edge 50a causes the impact of the collision and the paper 50.
It is presumed that this is because the impact and inertia did not affect the subsequent portion of the printing paper 50 because the inertia associated with the movement of was absorbed.

[0009]

The present invention was devised on the basis of the above-mentioned actual occurrence of slack, and
Large paper and thin paper such as Indian paper inevitably cause slack in physical strength, so deformation that increases the physical strength of the printing paper conversely by the time of collision of the backing plate. Is temporarily added to prevent the occurrence of the slack mentioned above.

Specifically, the present invention has a corrugated shape in which the corrugated head and the corrugated bottom are parallel to the traveling direction of the printing paper centering on the portion where the slack is generated at the leading end of the printing paper. And a device for forming a corrugation that enhances the physical strength.

[0011]

In the printing paper which has advanced at a high speed, just before the tip end edge of the printing paper collides with the backing plate, the connection between the corrugated top and the corrugated bottom is parallel to the traveling direction of the printing paper. A wave-shaped deformation is applied so that the connection between the wave head and the wave bottom is substantially orthogonal to the backing plate. Due to this deformation, the physical strength of the printing paper is significantly improved, and the slack mentioned above is prevented from occurring by withstanding the impact and inertia when the backing plate collides. This deformed state is temporary and completely disappears when the front end of the printing paper is returned to the knife side.

[0012]

Embodiments of the method and apparatus according to the present invention will be specifically described below with reference to the drawings.

1 to 3 show a first embodiment. Reference numeral 1 in the figure is a backing plate of a mechanical folding machine for folding a printing paper for a book. Reference numeral 2 denotes a support member that is a bar-like object arranged in parallel in a fence shape. By arranging a large number of these support members 2 in parallel on the same plane, the upper surface of each support member 2 is formed as a moving surface of the printing paper. To be done. Each of these support members 2 is inserted through the pad plate 1, whereby the pad plate 1 is supported by each of the support members 2 and each of the support members 2
The distance from the folded portion of the printing paper to the backing plate 1 (corresponding to the distance L in FIG. 7)
Is adjustable.

Reference numeral 3 is a guide member fixed to the backing plate 1. The guide members 3 are fixedly mounted on the backing plate 1 so that they are located substantially in the middle of the insertion portion of the support member 2 in the width direction (longitudinal direction) of the backing plate 1. As shown in FIG. 2, the guide member 3 has a base portion 3a fixed to the backing plate 1 located below the insertion portion 1a of the support member 2, but gradually rises toward the tip portion 3b thereof. However, the tip portion 3b itself is formed so as to be located above the printing paper moving surface formed by the support member 2.

In the above-mentioned structure, the leading edge P1 of the thin photographic printing paper sheet P, which has advanced in the A direction at a high speed on the plurality of support members 2 arranged in parallel, is guided in the state of being close to the guide member 3. The portion located in the space between the tip portion 3b of the member 3 and the support member 2 and contacting the guide member 3 by further progressing descends along the lower side edge of the guide member 3. On the other hand, the part that is not in contact with the guide member 3 advances while contacting with each support member 2. That is, the printing paper P is, as shown in FIG. 3, the upper side edge of each support member 2 and each guide member 3.
The corrugated deformation is forced to come into contact with the lower side edge of the.

That is, as shown in FIG. 3, the printing paper P is attached to each support member 2
Of the guide member 3 and the wave bottom portion Pb at the lower side edge of each guide member 3 so that the wave head Pa and the wave bottom portion Pb are substantially parallel to the traveling direction A thereof. In this way, the wavy deformation is forcibly added. In the state where the corrugated deformation is applied in this way, the front end edge P1 of the printing paper P collides with the backing plate 1. Since the above-mentioned deformation is applied to the printing paper P at the time of a collision, the corrugated head Pa and the corrugated bottom Pb are reinforced against the impact and inertia applied in the traveling direction of the printing paper P, for example, like a corrugated sheet of building material. Serves as a department. As a result, the occurrence of slack as shown in FIGS. 8 and 9 is prevented, and the printing paper P is bent at the correct position. Note that this deformation is temporary and does not need to be extremely deformed as long as it is within a range capable of preventing the occurrence of the slack. Therefore, when the printing paper P is retracted due to folding, the deformation state is complete. Disappears. In the illustrated configuration, the height h (see FIG. 3) from the lower side edge of the base portion 3a of the guide member 3 to the upper side edge of the support member 2 is slightly exaggerated in order to make the configuration state of the device easy to understand. However, in reality, since the deformation that can prevent the occurrence of the slack is sufficient, this height h is small,
Therefore, even if the deformation is forced, no significant difference occurs in the change of the total length of the printing paper, and this deformation does not affect the folding accuracy of the printing paper.

4 and 5 show a second embodiment.

In this embodiment, the printing paper is deformed more smoothly. Reference numeral 4 denotes a lower guide member, which is a member having a function corresponding to that of the guide member 3 of the above-described embodiment. The lower guide member 4 is fixedly mounted on the backing plate 1 so that the base portion 4a is located between the support members 2 arranged in parallel and below the support member insertion portion 1a of the backing plate 1, and the guide member 3 is provided. Similarly, the whole is bent and formed so as to rise toward the front end thereof, and the front end portion 4b is formed so as to be located above the moving surface of the printing paper formed by the support member 2. The guide member 4 is curved and formed in a substantially arc shape in the width direction so that the back surface portion 4c with which the printing paper comes into contact corresponds to the corrugated wave bottom portion which is a forced deformation of the printing paper. The guide members 4 formed in this way are arranged every other space in the space between the support members 2 arranged in parallel.

Reference numeral 5 denotes an upper guide member, which is a support member (reference numeral 2) adjacent to the lower guide member 4 as shown in FIG.
It is fixed to the backing plate 1 so as to cover a part of a supporting member (indicated by reference numeral 2b) that is further adjacent to (a). The base 5a is located above each guide member 2 and is arranged so as to gradually descend toward the tip. On the other hand, each of the support members 2 is arranged so as to be inserted through the notch 5b of the upper guide member 5, so that the most distal end portion 5c of the lower guide member 5 moves the printing paper formed by the support member 2. It is configured to be located below the plane. The upper guide member surface 5d with which the printing paper contacts is curved and formed in a substantially arcuate shape in the width direction so as to have a shape corresponding to the wave crest Pa of the deformation formed on the printing paper.

In the above-mentioned structure, the printing paper P which has advanced in the direction A advances in the width direction so that a part thereof rides on the upper guide member 5, and each part sandwiched by the riding part is guided below. A wave crest Pa and a wave bottom Pb are formed along the front surface 5d and the back surface 4c of the guide members 5 and 4 while descending along the member 4 (see FIG. 5). Is not directly involved.

FIG. 6 is a perspective view of the printing paper P showing the entire corrugated deformation formed by the first and second embodiments.
The corrugated deformation forcibly formed by the above means increases the physical strength of the printing paper P and withstands the impact on the backing plate 1. As a result, the occurrence of the slack 50b shown in FIGS. 8 and 9 that shortens the total length of the printing paper is prevented, and accurate folding work can be performed even if the printing paper is transported at high speed. Although the collision portion of the printing paper in the above embodiment is an integral contact plate, depending on the folding machine, instead of such a contact plate, a large number of rod-shaped objects are erected in the width direction of the printing paper. There are also things. Even with such a structure, by attaching the guide member to each rod-shaped object,
It goes without saying that the present invention can be implemented.

Although the present invention has been described by taking the printing paper as an example, it can be easily guessed by those skilled in the art that almost all the work of folding the thin film can be carried out.

[0023]

As described above in detail, the present invention forcibly corrugates a large thin film such as a printing paper for a dictionary so that the wave head and the wave bottom are substantially parallel to the traveling direction of the thin film. Is a method and apparatus for temporarily applying the deformation of the thin film, the physical strength of the thin film is temporarily increased by this corrugated deformation, and the thin film is folded during this time so that the folding work can be performed at high speed and accurately. It becomes possible to carry out.

[Brief description of drawings]

FIG. 1 is a perspective partial view of a thin film reinforcing device showing a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective partial view of a thin film reinforcing device showing another embodiment of the present invention.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a partial perspective view of the printing paper showing a formation state of corrugated deformation on the printing paper.

FIG. 7 is a schematic cross-sectional view of a device for mechanically folding a printing paper.

FIG. 8 is a partial side view of the folding machine showing a state where slack is generated on the printing paper.

FIG. 9 is a perspective partial view of the photographic paper showing more specifically the slack generation state shown in FIG.

[Explanation of symbols]

 1 Supporting Plate 2 Supporting Member 3 Guide Member 3a Guide Member Base 3b Guide Member Tip 4 Lower Guide Member 4a Lower Guide Member Base 4b Lower Guide Member Tip 4c Lower Guide Backside 5 Upper Guide Member 5a Upper Guide Member Base 5b Notch 5c Top guide member tip 5d Top guide member surface P Printing paper (thin film) P1 Printing paper tip Pa Wave head Pb Wave bottom 50 Printing paper 50a Slack

Claims (5)

[Claims] 1. A method for preventing the occurrence of slack in the vicinity of the tip of the thin film due to the tip of the moving thin film colliding with a fixed object, wherein a wavy deformation is temporarily generated near the tip of the thin film. This corrugated deformation is caused so that the wave crest and the wave bottom are substantially parallel to the traveling direction of the thin film, and the corrugated deformation temporarily increases the physical strength of the thin film. The method for reinforcing a thin film is characterized in that the occurrence of the slack is prevented by 2. A plurality of support members are arranged substantially parallel to each other,
A backing plate is arranged so as to be orthogonal to the support member, and a backing plate is provided with a guide member, and the backing plate mounting base of the guide member is located under the support member, and the tip is located over the support member. The thin film that has been formed so as to travel toward the backing plate is formed by the guide member and the supporting member in the vicinity of the tip end so that the wave crest and the wave bottom are substantially parallel to the moving direction of the thin film. A thin film reinforcing device, characterized in that it is configured such that a corrugated deformation is temporarily and forcibly applied. 3. The guide member is fixed to a backing plate so as to be positioned between the support members arranged in parallel, and the corrugation is formed by the adjacent guide member and support member. The thin film reinforcing device according to claim 2. 4. The guide member is configured as a lower guide member and an upper guide member, and the lower guide member is configured such that the backing plate mounting base is located below the support member and the tip end is located above the support member. The upper guide member is formed obliquely, and the back plate mounting base is located above the support member,
Moreover, the support member is inserted through the notch so that the tip end portion is located below the guide member.
3. The thin film according to claim 2, wherein the lower guide member and the upper guide member are alternately arranged so that the corrugated deformation is applied to the thin film by the lower guide member and the upper guide member. Reinforcement device. 5. Of the front and back surfaces of the lower guide member and the upper guide member, at least the back surface of the lower guide member and the front surface of the upper guide member correspond to the cross-sectional shapes of the corrugated crest and corrugated bottom in the width direction thereof. 5. The thin film reinforcing device according to claim 4, wherein the thin film reinforcing device is formed in a substantially arc shape.