JPH0643093Y2 - Paper press brush for folding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a paper pressing brush that presses paper conveyed along a peripheral surface of a cylinder in a folding machine.

<Prior Art> A web-fed rotary printing machine is equipped with a folding machine that cuts a dried and cooled web after printing to a predetermined length or folds the web in a width direction or a length direction. . FIG. 3 is a cylinder array diagram showing a part of this folding machine. In FIG. 3, 11 is a web, 12 is a nipping roller, 13 is a cutting cylinder, 14 is a folding cylinder, and 15 is a gripping cylinder. These cylinders 13, 14, 15 are synchronized with each other in the directions shown by the arrows in the drawing. It is designed to be rotated. The cutting cylinder 13 is provided with two cutting blades 16 for cutting the web 11 at a predetermined size with an angular interval of 180 degrees, while the folding cylinder 14 facing the cutting cylinder 13 is in the same phase as the cutting blade 16. A receiving member (not shown) that cooperates with the cutting blade 16 is disposed on the inner side of the sheet, and two sets of needles 17 are provided adjacent to the receiving member so that the needles 17 can be retracted. Furthermore, the needle 17 and the approximately 90
Two sets of bayonet blades 18 are provided with an angular spacing of degrees. On the other hand, the gripping cylinder 15 facing the folding cylinder 14 is provided with two sets of gripping plates 19 which can be opened and closed at the same phase as the insertion blade 18.

Then, the web 11 is cut by the nipping roller 12 into a cutting cylinder 13
When the web 11 is fed between the folding cylinder 14 and the folding cylinder 14, the web 11 is cut at predetermined positions where the cutting blade 16 and the receiving member are engaged with each other, and the web 11 following the cutting line is pierced by the needle 17. Thus, the paper is held and wound around the lower half circumferential surface of the folding cylinder 14, and the trailing edge of the paper is cut by the cutting blade 16 as described above.
The central portion in the length direction of the trimming paper held by the needle 17 is the folding cylinder 14
When wound around the folding cylinder 14 until reaching the counter contact point of the gripper cylinder 15, the insertion blade 18 and the gripper plate 19 face each other across the cutting web, so that the central portion of the cutting paper is the insertion blade 18
It is held by the gripper plate 19 by being pushed by.
Then, the cutting paper is folded in half to become a signature, and the gripper
It is transported while being attached to the upper peripheral surface of 15.

Here, the paper cut at the contact points between the cutting cylinder 13 and the folding cylinder 14 is conveyed to the gripping cylinder 15 along the lower half circumferential surface of the folding cylinder 14, so the paper hangs down in this process. There is a risk that the paper tail will be exposed. This crack on the bottom of the paper is a scratch on the paper,
Since it causes quality problems such as wrinkles and corner folds, in order to prevent this, presser brushes 20 and 21 are provided along the lower peripheral surface of the folding cylinder 14, and the paper is placed on the folding cylinder 14 by these brushes 20 and 21. I try to press it.

In order to effectively prevent the trailing edge of the paper, the presser brush 21 on the downstream side in the paper transport direction has the tip of the folding cylinder 14 and the gripper cylinder.
It is desirable to be close to the grip position, which is the counter contact of 15. Therefore, conventionally, as shown in an enlarged view in FIG. 4, the tip portion 22 of the pressing brush 21 is bent or curved toward the folding cylinder 14 side so that the tip is inserted between the folding cylinder 14 and the gripping cylinder 15. .

<Problems to be Solved by the Invention> In the conventional pressing brush 21, the bristles 23 are flocked vertically to the channel base material 24, and the tip portion of the channel base material 24 is
Since the 22 is bent toward the folding cylinder 14, the hair 23 of the tip 22
Has the following properties. That is, (1) the tip 22
The bristles 23 are reverse bristles to the paper flow. That is, the tip 22
The bristles 23 are inclined with respect to the normal to the circumferential surface of the folding cylinder 14 such that the tips of the bristles are located on the upstream side in the paper transport direction.
(2) The tip density of the hair 23 is high at the bent portion of the tip 22. (3) The bristle length is short because the channel base material 24 of the tip portion 22 is close to the folding cylinder 14.

Therefore, as shown in FIG.
The paper 25 held and conveyed by the above is peeled off from the peripheral surface of the folding cylinder 14 mainly by the action of the reverse hair of the bristles 23, and the above-mentioned (1) to ( 3)
A large resistance force due to acts. As a result, when the paper 25 passes through the tip portion 22 of the presser brush 21, needle holes and blurring 26 are generated as shown in FIG. 6, and corners are broken, resulting in poor folding quality. was there.

On the other hand, the pressing brush 21 is attached via a pressing pressure adjusting device 27 as shown in FIG. 4, and when a defect such as the needle hole or the shake 26 occurs as described above, the pressing pressure adjusting device 27 is used. It is adjusted so as to reduce the paper pressing pressure of the tip portion 22 of the pressing brush 21. However, if the paper pressing pressure is too low, the effect of preventing the tail of the paper, which is the purpose of the main body, will be insufficient, so this adjustment work requires a high degree of skill of the operator and the working time is also long. Since it took time, it was a cause of lowering the operation rate of the folding machine.

The present invention solves the above-mentioned problems in the conventional presser brush, and reliably prevents paper edge misalignment and prevents the occurrence of poor folding quality such as needle holes, blurs, and corner folds. Is intended to be provided at low cost.

<Means for Solving the Problems> The paper pressing brush according to the present invention for solving the above-mentioned problems is arranged along the peripheral surface of the cylinder and is attached to the peripheral surface of the cylinder to In a paper pressing brush of a folding machine that presses the paper conveyed to the peripheral surface, the bristles at the tips close to the paired contact points of the two cylinders for delivering the paper are bristles with respect to the normal to the peripheral surface. Is inclined so that it is located on the downstream side in the paper transport direction.

<Operation> At the tip, since the bristles of the brush are inclined in the forward direction with respect to the conveying direction of the paper, the paper is prevented from being peeled from the peripheral surface of the cylinder, and the tips of the bristles are Close to the counter contact of the and effectively prevent the tail of the paper.

<Embodiment> An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a front view of an embodiment of the present invention. As shown in FIG. 1, along the folding cylinder 14, in the paper transport path toward the folding cylinder 14 that transfers the paper from the lower circumferential surface of the folding cylinder 14 to the holding cylinder 15 and the counter contact A of the holding cylinder 15, A lower paper pressing brush 31 is provided.
In this pressing brush 31, bristles 33 are vertically planted on a channel base material 32, and the channel base material 32 is curved concentrically along the circumferential surface of the folding cylinder 14 and close to the contact point A. The leading end portion 34 (the portion corresponding to the angle range a) is bent in a direction away from the folding cylinder 14. That is,
The bristles 33 of the tip portion 34 are bent so that the tip portion 34 moves away from the folding cylinder 14, so that the tips of the bristles are located on the downstream side in the paper transport direction with respect to the normal to the circumferential surface of the folding cylinder 14. On the other hand, its length gradually increases as it approaches the contact point A, that is, toward the tip. The bristles 33 of the portion other than the tip portion 34 (the portion corresponding to the angle range b) are parallel to the normal line.

A plurality of the lower paper pressing brushes 31 are arranged along the axial direction of the folding cylinder 14, and the pressing pressure adjusting device 27 adjusts the paper pressing pressure by moving toward and away from the folding cylinder 14. Has become.

According to such a lower paper pressing brush 31, since the direction of the bristles 33 at the tip end portion 34 is inclined in the forward direction with respect to the transport direction of the paper, the bristles 33 may separate the paper from the body circumferential surface. And the tip 34 has a high hair density,
Since the length of the 33 does not become short, the paper pressing pressure is prevented from becoming excessively large, and the occurrence of needle holes, blurring, and corner bending are prevented. On the other hand, since the bristles 33 of the tip end portion 34 extend toward the downstream side of the paper conveyance direction, that is, toward the counter contact A, the bristle tip can be brought close to the counter contact A, whereby the pucker of the paper tail ends. Can be effectively prevented.

Further, as described above, since the paper pressing pressure at the tip portion 34 does not become excessive, the range of the appropriate value of the paper pressing pressure is widened, and as a result, the paper pressing pressure adjustment by the pressing pressure adjusting device 27 is rough, and Since the adjustment frequency can also be reduced, it is possible to increase the operating rate of the folding machine.

Further, in this embodiment, since the channel base material 32 is simply bent, the manufacturing cost is not increased.

FIG. 2 is a front view of another embodiment of the present invention. In the above-mentioned embodiment, the bristles 33 of the tip portion 34 are inclined by bending the tip portion of the channel base material 32.
A small brush 35, which is a separate member, is disposed in the 34.
That is, as shown in FIG. 2, in the present embodiment, the lower paper pressing brush 31 has a small brush 35 located in a portion corresponding to the angle range a and a large brush 35 located in a portion corresponding to the angle range b.
It consists of 36. This large brush 36 has bristles 33 parallel to the normal to the circumferential surface of the folding cylinder 14, while the small brush 35 at the tip 34.
The bristles 33 are inclined such that the tips of the bristles 33 are located on the downstream side in the paper transport direction. The small brush 35 may be connected to the large brush 36 so as to be supported integrally with the large brush 36 by the pressing pressure adjusting device 27, or may be supported separately from the large brush 36 by another supporting device (not shown). It may be done.

In the present embodiment, the bristles 33 of the small brush 35 are inclined in the forward direction with respect to the paper transport direction, so that not only the same effects as the above-described embodiments can be obtained, but also by adjusting the small brush 35 separately. It becomes possible to obtain more accurate folding quality.

The angle range a of the tip portion 34 is appropriately selected according to the operating conditions such as the specifications of the folding machine and the signature.

<Advantages of Device> As described above in detail with reference to the embodiments, according to the present invention, the bristles of the tip of the paper pressing brush are directed in the direction of conveyance of the paper with respect to the normal line of the body circumferential surface. Since it is inclined so as to be located on the downstream side, it is possible to prevent the occurrence of poor folding quality such as needle holes, blurring, and corner folding, and it is possible to widen the appropriate range of the paper pressing pressure. Further, since the bristle tips of the tips can be brought close to the delivery positions of both cylinders, it is possible to effectively prevent the trailing edge of the paper to the end.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a front view of another embodiment of the present invention, and FIG. 3 is a cylinder showing a part of a folding machine as an example of the application of the present invention. An array diagram, FIG. 4 is a front view of a pressing brush according to a conventional example, FIG. 5 is an explanatory diagram of a defect of the conventional example, and FIG. 6 is an explanatory diagram of needle holes and blurring. In the drawing, 14 is a folding cylinder, 15 is a gripping cylinder, 31 is a lower paper holding brush, 32 is a channel base material, 33 is bristles, 34 is a tip portion, and 35 is a small brush.

Claims (3)

[Scope of utility model registration request] 1. A paper pressing brush of a folding machine, which is arranged along the peripheral surface of a cylinder and presses the paper which is attached to the peripheral surface and conveyed to the next cylinder to the peripheral surface, In the folder, the bristles of the tip end portions close to the pair of contact points of the two drums for delivery are inclined so that the bristle tips are located on the downstream side in the paper transport direction with respect to the normal line of the peripheral surface. Paper press brush. 2. The paper pressing brush comprises a base material curved substantially along the peripheral surface of the cylinder, with bristles vertically planted, and the base material is bent so as to be away from the cylinder at the tip end portion. The paper pressing brush for a folder according to claim 1, wherein the length of the bristles is gradually increased toward the tip. 3. The paper pressing brush for a folder according to claim 1, wherein a small brush having bristles inclined with respect to the normal is provided as a separate body at the tip portion.