JP2000343492A - Slit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve average quality of web in a slit device. SOLUTION: A slit device is mounted on a running path of a web 1 to have the web 1 cut along its running direction, and is provided with a rotary cutting blade 6 adapted to cut the web 1, a rotary receiving blade 8 facing the cutting blade 6 to have it arranged on the opposite side of the web 1, a pair of pressing rollers 13 and 13 mounted on both sides of the cutting blade 6, and a pressing member 8 which is mounted on the receiving blade 8 side to hold the web 1 between the pressing rollers 13 and 13 in conjunction with a pair of the rollers 13 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slit device provided on a traveling path of a web for cutting the traveling web along the traveling direction.

[0002]

2. Description of the Related Art As shown in FIG. 3, a slit device (hereinafter, also referred to as a slitter) for cutting a running web in a printing machine or the like along a running direction has been developed. FIG. 3 shows that after printing is performed on web 1,
2 shows a part of the configuration of a printing press that cuts and discharges a signature 11 having a predetermined shape. The web 1 printed by a printing device (not shown) is cut along a running direction by a slitter 25a. As shown in the figure, the webs 1a,
1b is conveyed to the folding machine 10 via the turning bar 4, the plurality of guide rollers 2 and the drag roller 3a, and is folded by the folding machine 10 in a predetermined procedure to obtain a signature of a preset shape. Conveyor 3
Emitted by 0,30. The turning bar 4 is provided substantially horizontally with respect to the running surface of the web 1 when passing through the slitter 25a, and in the process of passing through the turning bar 4, the running direction of each web 1a, 1b is changed.

The folding machine 10 has three rollers 10a,
10b and 10c.
0c has a blade (not shown). First, the webs 1a and 1b fed to the folder 10 are rollers 10b and 10b.
c, and is cut in the width direction by the blade of the roller 10c, and then sent between the rollers 10a and 10b to be folded into a predetermined shape.

Here, the slitter 25a will be described. The slitter 25a is provided with a drag roller 3 provided on the traveling path of the web 1, and a substantially disk-shaped cutting provided on the opposite side of the web 1 opposite to the drag roller 3. It has a blade 6. Although omitted in FIG. 3,
The slitter 25a is provided with a substantially disk-shaped receiving blade 28, similarly to the slitter 25b shown in FIG.

The slitter 25a shown in FIG. 3 shows an example in which the receiving blade is provided on the same axis as the drag roller 3 so that the receiving blade rotates integrally with the drag roller 3, and the slitter 25b shown in FIG. , The receiving blade 28 is supported by the receiving blade shaft 12 and provided independently. FIG. 4 is a schematic sectional view of the web 1 viewed from the running direction, and FIG.
In the direction of arrow A in FIG.

[0006] A concave portion (annular concave portion) 28a (see FIG. 4) is formed over the entire peripheral surface of the receiving blade 28 of the slitter 25a, and the cutting blade 6 has its outer periphery (blade surface).
Are disposed so as to enter the annular concave portion 28a. Further, the receiving blade 28 and the cutting blade 6 are both web 1
It rotates along the traveling direction of. Thereby, the web 1 can be cut along the running direction while being sandwiched between the receiving blade 28 and the cutting blade 6.

[0007] The slitter 25b is the same as the slitter 25 described above.
3A, the webs 1a and 1b provided on the upstream side of the folding machine 10 in the web running direction to cut the web 1 along the running direction and cut by the slitter 25b are shown in FIG.
Is transported to the folding machine 10 via the turning bar 4, the plurality of guide rollers 2, the drag roller 3a, and the like (see FIG. 3).

As shown in FIG. 4, the slitter 25b comprises a cutting blade 6 and a receiving blade 2 which face each other with the web 1 interposed therebetween.
The cutting blade 6 is disposed so that the outer periphery (blade surface) of the cutting blade 6 enters the annular concave portion 28 a of the receiving blade 28. The cutting blade 6 is connected to a drive shaft 7a of a slitter motor 7 supported on a frame (not shown) of the printing press, and is driven to rotate in the same direction as the traveling direction of the web 1 by the slitter motor 7. . The receiving shaft 12 provided integrally with the receiving blade 28 has bearings 12a on both sides thereof.
And is rotatably supported by
The gear 9 a is fixedly mounted on the same axis as the receiving shaft 12. The gear 9a meshes with the gear 9b, and
b meshes with a gear 9c that rotates integrally with the drive shaft 9. Thereby, the receiving blade shaft 12 is provided with the gears 9a, 9b, 9c.
, The web 1 is driven to rotate in the same direction as the traveling direction of the web 1 by a driving force input from the driving shaft 9. The bearings 12a are provided on a frame (not shown) of the printing press.

With such a configuration, the cutting blade 6 and the receiving blade 2
8 cuts the web 1 running between the cutting blade 6 and the receiving blade 28 in cooperation with each other while rotating in the same direction as the running direction of the web 1. That is, the outer peripheral surface 28 of the receiving blade 28
b, 28b, the web 1
The cutting blade 6 is cut by the blade surface of the cutting blade 6 disposed so as to enter between the b and 28b (the annular concave portion 28a).

Then, the above-mentioned slitter 25a,
In the case of 25b, in order to maintain the quality of the web (printed material) 1 by keeping the cut (cut line) of the web 1 straight,
In addition to accurately maintaining the relative position between the cutting blade 6 and the receiving blade 28 at an optimum position, it is important to apply sufficient tension to the web 1. That is, the web 1 is pressed against the receiving blade 28 (annular concave portion 28 a) by the cutting blade 6. By applying sufficient tension to the web 1, the force in the pressing direction becomes a reaction force, and the web 1 is cut by the cutting blade 6. 6, the web 1 is cut straight.

Incidentally, in the slitter 25a of FIG. 3 and the slitter 25b of FIG. 4, the rotation direction of the cutting blade 6 may be set in a direction opposite to the running direction of the web 1. Also,
In the printing press shown in FIG. 3, the web 1 may be fed to the folding machine 10 without being cut by a slitter as shown by a two-dot chain line in the drawing. In this case, the web 1 is a drag roller 3
b, the triangular plate 2b, and the lead-in rollers 2a, 2a. The web 1 is folded in two along the web traveling direction while passing through the triangular plate 2b.

[0012]

However, the above-mentioned slit device has the following problems. That is,
As shown in FIG. 3, each of the webs 1a and 1b cut by the slitter 25a (or the slitter 25b shown in FIG. 4) is fed to the turning bar 4, and changes its direction while passing through the turning bar 4. When passing the turning bar 4, a large passage resistance is applied to the webs 1 a and 1 b, so that the tension on the upstream side of the turning bar 4 is lower than on the downstream side.

That is, a large force acts on the webs 1a and 1b in the direction opposite to the running direction by the turning bar 4, and the tension of the web 1 is reduced on the upstream side of the turning bar 4 in the web transport direction. Particularly, as shown in the drawing, the web 1a is first fed to the turning bar 4 after cutting, so that the passing resistance acts directly on the web 1 passing through the slitter 25a (or the slitter 25b shown in FIG. 4). Therefore, the tension of the web 1 is reduced.

When the tension of the web 1 passing through the slitters 25a and 25b is reduced, the web 1 is pushed into the annular recess 28a of the receiving blade 28 by the cutting blade 6 as shown in FIG. 25a, 25b
The sharpness of the wood will be reduced. For this reason, there arises a problem that the straightness of the cutting line (cut) is reduced and the commercial value of the web (printed material) 1 is reduced. In an extreme case,
There is a possibility that the running web 1 may break the paper.

Further, for example, an adjusting mechanism for adjusting the tension of the web 1 is provided upstream of the slitters 25a and 25b in the traveling direction of the web 1, and when the tension of the web 1 decreases, the adjusting mechanism is used by the adjusting mechanism. In some cases, the tension of the web 1 is recovered. However, for this purpose, it is necessary to constantly monitor the tension of the web 1, and it is necessary to make such adjustment whenever the tension of the web 1 decreases. , Resulting in poor work efficiency.

The present invention has been made in view of the above problems, and has as its object to provide a slit device capable of improving the average quality of a web.

[0017]

According to a first aspect of the present invention, there is provided a slit device provided on a traveling path of a web for cutting the traveling web along a traveling direction. A rotary cutting blade for cutting the web, a rotary receiving blade disposed on the opposite side of the web opposite to the cutting blade, and a pair of pressing rollers provided on both sides of the cutting blade; It is characterized in that it is provided with a pressing member provided on the receiving blade side and cooperating with the pair of pressing rollers to hold the web.

The slit device according to the second aspect of the present invention comprises:
2. The slit device according to claim 1, wherein the contact surfaces of the pair of pressing rollers contacting the web are formed with uneven tooth surfaces, and the tooth surfaces are inclined with respect to the width direction of the pressing roller. The pair of pressing rollers are formed in a helical shape, and the helical tooth surfaces of the pair of pressing rollers are formed symmetrically with respect to the cutting blade.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIG. 1 is a schematic diagram partially broken away showing the entire configuration of a slit device (hereinafter also referred to as a slitter) as a first embodiment of the present invention, and shows a web running. FIG. 4 is a diagram viewed from the front in the direction (a diagram corresponding to a view in the direction of arrow A in FIG. 3).

A slitter 5 according to a first embodiment of the present invention
a is applied to a printing machine as shown in FIG. Since the printing press is configured substantially the same as the conventional printing press shown in FIG. 3 except for the slitter, hereinafter, the printing press will be referred to with reference to FIG. Here, the slitter 5a of the present embodiment will be described. The same components as those described as the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

A slitter 5 according to a first embodiment of the present invention
a is provided upstream of the folding machine 10 in the web traveling direction to cut the web 1 along the traveling direction, similarly to the conventional slitter (see reference numeral 25a in FIG. 3 and reference numeral 25b in FIG. 4). Web 1a cut by 5a,
1b is conveyed to the folder 10 via the turning bar 4 etc. (refer FIG. 3).

Of the cut webs 1a and 1b, particularly, the web 1a passes through the turning bar 4 having a large passage resistance immediately after being cut by the slitter 5a. As described above as a problem of the prior art, when the web 1a passes through the turning bar 4, the web 1a receives a passing resistance, and the passing resistance directly acts on the web 1 passing through the slitter 5a, and On the upstream side, the tension of the web 1 decreases.

Therefore, the slitter 5a according to the first embodiment of the present invention is provided with a pair of paper pressing rollers (pressing rollers) 13 on both sides of the cutting blade 6 in comparison with the conventional slitter 25b shown in FIG. And the outer peripheral surface 8 of the receiving blade 8
b, 8b are paper pressing rollers 13, 1
3 (that is, the outer peripheral surfaces 8b, 8b of the receiving blade 8 cooperate with the paper pressing rollers 13, 13 to function as a pressing member for holding the web 1). ing. Thereby, even if the tension of the web 1 is reduced due to the passing resistance of the turning bar 4 as described above, the web 1 is
Since the outer peripheral surface 8 b of the receiving blade 8 is gripped by the paper pressing roller 13, the cutting point 17 located between the paper pressing rollers 13, 13 (the point at which the web 1 is cut by contact with the blade surface of the cutting blade 6). For ()), a predetermined tension is maintained.

A slitter 5 according to a first embodiment of the present invention
More specifically, the slitter 5a has a substantially disk-shaped cutting blade 6 for cutting the web 1 as shown in FIG. It has a substantially columnar receiving blade 8 to be provided. An annular concave portion 8a is provided on the peripheral surface of the receiving blade 8, and the cutting blade 6 is disposed so that the outer periphery (blade surface) enters the annular concave portion 8a. The cutting blade 6 and the receiving blade 8 are both driven to rotate in the same direction as the traveling direction of the web 1.

The receiving blade 8 is a conventional slitter (reference numeral 2 in FIG. 4).
5b), the rotary shaft (blade receiving shaft) 12 has a bearing 12a, 1 provided on a frame (not shown) of the printing press.
2a rotatably supported by gears 9a, 9
The rotational driving force of the drive shaft 9 is transmitted via the b and 9c. On the other hand, a rotary shaft (cutting blade axis) 15 is fixedly mounted on the cutting blade 6 on the same axis.
Are rotatably supported on both sides by a support device 20 via bearings 15a, 15a. The support device 20 is attached to a frame (not shown) of the printing press, and has a position adjusting mechanism (not shown). The position adjusting mechanism moves the cutting blade 6 in the radial direction and the axial direction. Thereby, the relative positional relationship between the cutting blade 6 and the receiving blade 8 can be adjusted so that the sharpness of the slitter 5a is improved.

The cutting blade 6 is driven to rotate by a slitter motor 7 supported by a supporting device 20. As shown in the figure, a pulley 15b is fixed to the end of the cutting blade shaft 15, while a pulley 7b is fixed to the drive shaft 7a of the slitter motor 7. The drive belt 21 is stretched between the pulleys 7b and 15b. As a result, the rotational driving force of the slitter motor 7 is reduced by the pulley 7b, the drive belt 21, and the pulley 15b.
Is transmitted to the cutting blade 6 so that the cutting blade 6 is driven to rotate in the same direction as the traveling direction of the web 1.

The rotation direction of the cutting blade 6 may be set to be opposite to the running direction of the web 1.
Further, similarly to the conventional slitter 25b shown in FIG. 4, the cutting blade 6 may be directly driven by the slitter motor 7. As described above, a pair of paper pressing rollers 13, 13 are provided on both sides of the cutting blade 6, and the paper pressing rollers 13, 13 and the outer peripheral surfaces 8b, 8b of the receiving blade 8 form: The web 1 is pinched. Further, the paper pressing rollers 13 and 13 are rotatably supported by the cutting blade shaft 15 via bearings 14 and 14, respectively. For this reason, the paper holding rollers 13, 1
Numeral 3 is adapted to rotate in conjunction with a receiving blade 8 which comes into contact with the web 1 therebetween. Thereby, the paper holding roller 1
3, 13 and the receiving blade 8 cooperate with each other,
The web 1 is sandwiched and sent out between the blade 1 and the receiving blade 8. The outer peripheral surface of the paper pressing roller 13 has a flat shape.

The peripheral surface (surface layer) 16 of the paper pressing roller 13 is made of, for example, a soft metal, rubber or resin having a high friction coefficient, and thereby receives the web 1 with a sufficient pressing force. The web 1 is not damaged while being pressed against the blade 8. The surface layer 16
By using the above-described materials, even if the receiving blade 8 comes into direct contact with the paper pressing roller 13, the receiving blade 8 is not damaged.

On the other hand, the receiving blade 8 has a high friction coefficient and hardly wears out at a portion where the web 1 is pinched in cooperation with the paper pressing roller 13 (a portion which comes into contact with the paper pressing roller 13 across the web 1). It is preferable to use a material or to perform a surface treatment that has a high friction coefficient and is hardly worn. For example, quenched high hardness steel may be used, or tungsten carbide or the like may be sprayed on the surface.

An adjusting mechanism (not shown) for adjusting the tension of the web 1 is provided upstream of the slitter 5a in the web running direction.
Is provided, and when the tension of the web 1 is excessively reduced, the tension of the web 1 can be recovered by the adjusting mechanism. Since the slit device 5a according to the first embodiment of the present invention is configured as described above, the web 1 traveling between the cutting blade 6 and the receiving blade 8 is provided with paper presses on both sides of the cutting blade 6. Rollers 13, 13
While being sandwiched between the outer peripheral surfaces 8b and 8b of the receiving blade 8,
The cutting blade 6 cuts the sheet along the running direction.

As described above, of the cut webs 1a and 1b, especially the web 1a is directly conveyed to the turning bar 4 after cutting (see FIG. 3). Due to the passage resistance when passing, the tension of the web 1 is reduced entirely on the upstream side of the turning bar 4. On the other hand, according to the slit device 5a as the first embodiment of the present invention, the web 1 is provided with the paper pressing rollers 13, 13 on both sides of the cutting point 17 (point at which the web 1 is cut).
And the outer peripheral surfaces 8b, 8b of the receiving blade 8, the predetermined tension can be maintained.
The sharpness of a is maintained.

Therefore, since the web 1 can be cut with high precision, the cutting line (cut) of the web 1 can be held straight without being greatly affected by the tension setting during the transport of the web 1, whereby the web 1 can be cut. There is also the advantage that the average quality can be improved. If the tension of the web 1 is excessively reduced, it is necessary to recover the tension of the web 1 by an adjusting mechanism (not shown) provided on the upstream side of the slitter 5a in the web traveling direction. Since the tension is stably maintained, there is an advantage that the frequency of such adjustment is reduced and the quality of the web 1 can be easily maintained.

Next, the second embodiment will be described.
FIG. 2 is a schematic front view showing a configuration of a main part of a slit device according to a second embodiment of the present invention, as viewed from the front in the web traveling direction. The slitter according to the second embodiment of the present invention is applied to a printing press as shown in FIG. 3 similarly to the conventional art and the slitter 5a according to the first embodiment. Except for the rollers (pressing rollers) 13a and 13b, the configuration is substantially the same as the slitter 5a of the first embodiment shown in FIG. Therefore, the same components as those described in the related art and the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The slitter according to the second embodiment of the present invention includes a conventional slitter (see reference numeral 25a in FIG. 3 and reference numeral 25b in FIG. 4) and a slitter 5a according to the first embodiment of the present invention.
Similarly to (see FIG. 1), the webs 1a and 1b are provided upstream of the folding machine 10 in the web running direction to cut the web 1 in the running direction, and cut by the slitter along the running direction. Are transported to the folder 10 via the turning bar 4 and the like (see FIG. 3).

The slitter according to the second embodiment of the present invention is shown in FIG.
In the slitter 5a according to the first embodiment shown in FIG. 2, the paper pressing rollers 13 are replaced with the paper pressing rollers 13 shown in FIG.
a and 13b. That is,
Although the peripheral surfaces of the paper press rollers 13 and 13 of the first embodiment are formed flat, the peripheral surfaces of the paper press rollers 13a and 13b (each of the paper press rollers 13) according to the second embodiment.
a, 13b) are helical tooth surfaces 23a, 23b inclined with respect to the roller width direction.
Are formed. Each of these paper holding rollers 13a,
As shown, the tooth surfaces 23a and 23b of the 13b are formed substantially symmetrically with respect to the cutting blade 6, and the inclination thereof is such that the web 1 spreads outward in the width direction when the paper pressing rollers 13a and 13b rotate. Is formed.

That is, similarly to the first embodiment, the slitter according to the second embodiment of the present invention is provided with a cutting blade 6 for cutting the web 1 and disposed on the opposite side of the web 1 so as to face the cutting blade 6. The cutting blade 6 is arranged so that its outer periphery (blade surface) enters the annular concave portion 8a (see FIG. 1). As shown in FIG. 2, the slitter according to the second embodiment of the present invention includes a pair of paper pressing rollers 13a and 13b rotatably supported by a cutting blade shaft 15 on both sides of the cutting blade 6. These paper pressing rollers 13a, 13b cooperate with the outer peripheral surfaces 8b, 8b of the opposed receiving blade 8 to hold the web 1 similarly to the first embodiment. In the present embodiment, the helical tooth surfaces 23a, 23b inclined with respect to the roller width direction are provided on the surfaces of the paper pressing rollers 13a, 13b as described above.
It is provided over the entire circumference.

As described above, the tooth surfaces 23a and 23b are substantially plane-symmetric with respect to the cutting blade 6 (so that the inclination directions of the tooth surfaces 23a and 23b are opposite to each other) as shown in FIG. The inclination of the paper holding rollers 13a, 13a
The web 1 is formed so that the web 1 spreads outward in the width direction when the b rotates. Therefore, such a paper holding roller 1
A tension acts in the width direction on the web 1 sandwiched between the blades 3a and 13b and the receiving blade 8, so that the web 1 can be cut accurately without cutting into the annular recess 8a at the time of cutting.

Here, the paper pressing rollers 13a, 13b
The reason why tension is generated in the web 1 will be described below. The web 1 sandwiched between the paper pressing rollers 13a and 13b and the receiving blade 8 is provided on both sides of the cutting blade 6 with the paper pressing rollers 1a.
3a and the tooth surface 23 of the paper pressing roller 13b
b. For this reason, the web 1
Only the movement along the inclination of a and 23b is allowed, and the movement in other directions is restricted. That is, a force is applied to the web 1 at the contact surface with the paper pressing rollers 13a, 13b in accordance with the rotation of the paper pressing rollers 13a, 13b along the inclination of the tooth surfaces 23a, 23b. . Here, the paper pressing rollers 13a, 13b
Is the side driven by the running of the web 1,
As shown in FIG. 2, the inclination of the tooth surfaces 23a and 23b is formed so as to spread outward in the web feeding direction on the contact surface with the web 1. Therefore, Web 1
Is to move outward along the inclination of the tooth surfaces 23a and 23b in the running direction of the web 1. The directions of these forces are plane-symmetric with respect to the cutting blade 6 with respect to the paper pressing rollers 13a and 13b, and are separated in a direction obliquely forward with respect to the feeding direction of the web 1. Of these force directions, component forces acting in the width direction of the web 1 act in directions that pull the web 1 together. That is, a force (tension) is generated on the web 1 on both sides of the cutting blade 6 in directions opposite to each other in the width direction and in a direction in which the web 1 is expanded.

When a driving force is applied from the paper pressing rollers 13a, 13b to the web 1 side, the inclination of the tooth surfaces 23a, 23b depends on the contact direction with the web 1 in the feeding direction of the web 1. What is necessary is just to form so that it may be pinched inside toward. In this case, since the web 1 receives the driving force from the paper pressing rollers 13a and 13b, the web 1 receives the driving force from the paper pressing rollers 13a and 13b as a reaction force of the driving force.
A force acts opposite to the rotation direction of 13b (feeding direction of the web 1) and along the inclination of the tooth surfaces 23a and 23b.
That is, a force acts on the web 1 to spread the web 1 in the width direction.

The shape of the tooth surfaces 23a, 23b of the paper pressing rollers 13a, 13b may be any as long as they act to spread the web 1 in the width direction. It does not need to be symmetric with respect to.
Further, in the example shown in FIG. 2, the tooth surfaces 23a and 23b are formed in a straight line, but the teeth themselves may be formed in a curved line.

The other configuration is substantially the same as that of the slitter 5a of the first embodiment, and the description is omitted. Since the slit device according to the second embodiment of the present invention is configured as described above, the web 1 traveling between the cutting blade 6 and the receiving blade 8 has a paper pressing roller on both sides of the cutting blade 6. 13
While being sandwiched between the a and 13b and the outer peripheral surfaces 8b and 8b of the receiving blade 8, the blade is cut by the cutting blade 6 along the traveling direction.

Here, the cut web 1a is configured to be conveyed to the turning bar 4 having a large passing resistance after the cutting (see FIG. 3). The tension of the wire will decrease.
However, similarly to the slitter 5a of the first embodiment, both sides of the web 1 are supported by the paper pressing rollers 13a, 13b and the outer peripheral surfaces 8b, 8b of the receiving blade 8, so that the cutting point 17 (see FIG. 1). Then, the web 1 is maintained at a predetermined tension. Further, the web 1 has a helical tooth surface 2
The web 1 is sandwiched between the paper holding rollers 13a, 13b having the bases 3a, 23b and the receiving blade 8.
A force (tension) that spreads in the width direction acts.

Therefore, the web 1 at the cutting point 17 is applied with a larger tension than the slitter 5a of the first embodiment, and therefore, there is an advantage that the web 1 can be cut with higher accuracy. Further, the tooth surfaces 23a, 23a of the paper pressing rollers 13a, 13b.
Since the inclination of 3b is substantially symmetrical with respect to the plane, the tension acting on the web 1 is also uniformly distributed in the width direction of the web 1 due to the inclination, and the web 1 can be cut with high accuracy. There is also an advantage.

The slit device of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above-described embodiments, the thickness of the both sides of the annular concave portion 8a of the receiving blade 8 is increased so that the receiving blade 8 functions as a pressing member that holds the web 1 in cooperation with the paper pressing roller. The receiving blade 8 has a conventional thickness (the receiving blade 28 shown in FIG. 4), and the receiving blade 8 is provided on both sides of the receiving blade 28 having the conventional thickness. A pair of holding members may be provided separately from the blade 28. In this case, for example, a substantially disc-shaped pressing member may be fixed to the receiving blade shaft 12 at a position facing each paper pressing roller.

In each of the above-described embodiments, the paper pressing roller is provided rotatably with respect to the cutting blade shaft 15, but the paper pressing roller is integrated with the cutting blade shaft 15 (cutting blade 6). You may comprise so that it may rotate. In this case, since the cutting blade shaft 15 rotates in conjunction with the receiving blade 8 via the paper pressing roller, as a result, the cutting blade 6 also rotates in conjunction with the receiving blade 8, and the slitter 15 rotates. Motor 7 (FIG. 1)
) Can be omitted.

The present invention can be applied not only to the printing press as in the above-described embodiments but also to various apparatuses of a system for cutting a web by a slitting apparatus.

[0047]

As described above in detail, according to the slit device of the present invention, the web running between the cutting blade and the receiving blade has a pair of webs provided on both sides of the cutting blade. The sheet is cut by the cutting blade along the traveling direction while being held between the pressing roller and the pressing member provided on the receiving blade side. As described above, since the web is sandwiched between the pressing roller and the pressing member, a predetermined tension is maintained at the cutting point. Therefore, since the web can be cut with high precision, the cutting line (cut) of the web can be kept straight without being greatly affected by the tension setting at the time of transporting the web, thereby reducing the average quality of the web. There is also the advantage that it can be improved. Further, even when the tension of the web is affected by a member (for example, a turning bar) adjacent to the slitting device, the web tension is maintained at the cutting point, so that the quality of the web can be maintained. is there.

According to the slit device of the present invention, the web is sandwiched between a pair of pressing rollers having helical tooth surfaces and a pressing member. Since the helical tooth surface is formed symmetrically with respect to the cutting blade, when the pressing roller rotates,
A force that spreads in the width direction can be applied. Therefore, in this case, a greater tension is generated on the web at the cutting point than in the slit device according to the first aspect, so that there is an advantage that the web can be cut with higher accuracy.

Furthermore, since the inclination of the helical tooth surface of the pressing roller is formed symmetrically, the tension acting on the web due to this inclination also becomes evenly distributed in the width direction of the web. The web can be cut with high precision.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic view showing the entire configuration of a slit device as a first embodiment of the present invention, viewed from the front in the web running direction (corresponding to the arrow A direction in FIG. 3). Figure).

FIG. 2 is a schematic front view showing a main configuration of a slit device as a second embodiment of the present invention, as viewed from the front in a web traveling direction.

FIG. 3 is a schematic perspective view showing a configuration of a conventional slitting device and a main portion of a printing machine provided with the slitting device.

FIG. 4 is a schematic diagram showing a configuration of a conventional slit device, partially cut away, as viewed from the front in the web running direction (FIG.
FIG. 3 is a view corresponding to a view in the direction A of FIG.

FIG. 5 is a schematic cross-sectional view illustrating a configuration of a main part of a slit device for describing a problem of a conventional slit device.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 web 2 guide roller 4 turning bar 5a slitting device (slitter) 6 cutting blade 7 motor for slitter 7a drive shaft 7b, 15b pulley 8 receiving blade 8a having function as holding member 8a annular concave portion 8b outer peripheral surface 9 drive shaft 9a, 9b, 9c Gear 12 Receiving blade shaft 12a, 14, 15a Bearing 13, 13a, 13b Paper press roller (press roller) 15 Cutting blade shaft 16 Surface layer 17 Cutting point 20 Support device 21 Drive belt 23a, 23b Tooth surface

Claims (2)

[Claims] 1. A slit device provided on a traveling path of a web for cutting the running web along a traveling direction, comprising: a rotary cutting blade for cutting the web; A rotary receiving blade disposed on the opposite side of the web, a pair of pressing rollers provided on both sides of the cutting blade, and a pair of pressing rollers provided on the receiving blade side in cooperation with the pair of pressing rollers. A slit device comprising a holding member for holding a web. 2. A pair of pressing rollers each having an abutting surface which is in contact with the web, having an uneven tooth surface, wherein the tooth surface is in a helical shape inclined with respect to the width direction of the pressing roller. The slit device according to claim 1, wherein the helical tooth surfaces of the pair of press rollers are formed symmetrically with respect to the cutting blade.