JPH10330034A - Sheet winding preventive mechanism of paper cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism to prevent a continuous sheet of paper from winding in a cutting device. SOLUTION: A saw drum 2 and receptacle drum 3 of a cutting device are bored with the third passages 27 and 37 in communication with an air piping system provided outside the device. In the third passages 27 and 37, small holes 28 and ones 38 leading to the surfaces of the drums 2 and 3, respectively, are furnished in the longitudinal direction of the drums 2 and 3. Immediately after a continuous sheet of paper is cut by saw blade 7, air is injected to the cut face of the sheet from the small holes 28 and 38 so as to prevent the sheet from winding fast on the drums 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper winding preventing mechanism of a cutting device applied to a folding section of a rotary press.

[0002]

2. Description of the Related Art In recent years, with the spread and diversification of rotary presses, sheet-shaped prints without needle holes have been manufactured by rotary presses. This type of printed matter is cut out to a predetermined size by a cutting device of a folding unit and discharged from a continuous sheet printed and sent out by a printing unit of a rotary press. FIGS. 7 and 8 show a conventional cutting device in a folding section of such a rotary press. The cutting device 50 includes a saw cylinder 2 having a saw blade 7.
And a receiving cylinder 3 having a saw blade receiver 8.
The saw blade receiver 8 provided at a position opposed to the above is configured to meet each rotation. The saw cylinder 2 and the receiving cylinder 3 rotate when gears 12 and 13 attached to respective shaft ends mesh with each other. The continuous paper 1 printed and sent to the folding section is introduced between the rotating saw cylinder 2 and the receiving cylinder 3 sandwiched between the left and right paper guide belts 4a and 4b.
The continuous paper 1 inserted between the saw cylinder 2 and the receiving cylinder 3 is cut into a predetermined size by the blade edge of the saw blade 7 in the saw cylinder 2 piercing the saw blade receiver 8 of the receiving cylinder 3.

A sheet-shaped printed material 1S obtained by cutting the continuous paper 1 to a predetermined size passes between the left and right paper guides 5a and 5b disposed below the saw cylinder 2 and the receiving cylinder 3, and passes through the conveyor belts 6a and 6b.
6b, the sheet is conveyed downward, is received one by one by an impeller of a sheet discharging device (not shown), is placed on a sheet discharging conveyor, and is discharged out of the device. In the conventional cutting device 50, the saw blade-shaped cut edge cut by the saw cylinder 2 and the receiving cylinder 3 does not enter between the paper guides 5a and 5b, and the saw blade receiver 8 is not used.
In some cases, paper may be wrapped around the receiving cylinder 3 or the saw cylinder 2 by sticking to the saw blade 7. In order to prevent this, as shown in FIG. 8, the tip of the paper guide 5b is inserted into a plurality of ring-shaped grooves 9 provided on the surface of the cylinder 3, and the saw blade 7 of the saw blade assembly 22 is An elastic member 52 such as a sponge tape or a magic tape is attached to a rear part in the rotation direction and a rear part in the rotation direction of the saw blade receiver 8 of the saw blade receiver assembly 32. Accordingly, the cutting device 50 causes the cut saw-shaped cut by the restoring force of the elastic member 52 sandwiched between the two cylinders 2 and 3 immediately after cutting, thereby preventing the paper from being wound. I was

[0004]

However, such conventional measures for preventing paper winding have caused the following problems with the reduction in the weight of the printing paper and the speed of the rotary press. (A) If the leading end of the paper guide 5a is brought as close as possible to the saw cylinder 2 to prevent paper winding, the contact angle of the continuous paper 1 with the cut edge becomes worse, and rubbing scratches and stains occur on the printing surface,
In addition to deteriorating the quality of the printed matter, the machine had to be stopped for each readjustment, which hindered productivity. In addition, since the set gap with the saw blade device is limited and incomplete, if the paper is rolled during high-speed operation, the trunk is bent, making it impossible to quickly repair, and serious damage may be caused.

(B) The elastic member 52 such as a sponge tape or a magic tape adhered to the body surface loses elasticity when used for a long time, loses restoring force and wears severely. The elastic member 52 must be replaced according to the quality of the printing paper.
It was necessary to adjust the thickness, which took a lot of trouble. (C) If the amount of generated static electricity increases due to changes in the operating speed, the temperature of the dryer, or the environmental temperature such as the indoor temperature and humidity, especially in the case of lightweight paper, the stiffness of the paper is weak, and the behavior of the paper changes, and the paper is wound Driving speed,
Adjustment of the leading end of the paper guide 5a was necessary. SUMMARY OF THE INVENTION The present invention has been made in view of solving these problems, and there is no continuous paper wrapping around a saw cylinder or a receiving cylinder, and a cigarette of a cutting device capable of stably operating the cutting device. It is an object to provide a prevention mechanism.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a saw cylinder having a substantially cylindrical shape and having a saw blade on its surface, and a receiver having a substantially cylindrical shape and having a saw blade receiver on its surface. A cutting device for cutting the continuous paper to a predetermined length by rotating the saw blade and the receiving cylinder, wherein the saw cylinder and the receiving cylinder are arranged adjacent to each other with their central axes parallel to each other. A mechanism for injecting air from the respective surface portions of the cylinder and the receiving cylinder toward the cutting end of the continuous paper is provided inside the saw cylinder and the receiving cylinder, and the continuous paper is formed by the air with the saw cylinder and This is achieved by a paper winding prevention mechanism of a cutting device, wherein the paper winding prevention mechanism prevents the paper from being wound around the surface of the receiving cylinder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a paper winding preventing mechanism of a cutting apparatus according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a cutting device 10 according to the present invention includes a cylindrical saw cylinder 2 and a receiving cylinder 3 for cutting a continuous paper 1 that is printed and sent to a folding section.
The saw cylinder 2 and the receiving cylinder 3 are disposed adjacent to each other with their rotation axes parallel to each other. The saw cylinder 2 is provided with a saw blade 7, and the receiving cylinder 3 is provided with a saw blade receiver 8. I have. The continuous paper 1 is cut into predetermined dimensions in the horizontal direction at regular intervals by the saw blade 7 being stuck into the saw blade receiver 8 to form a sheet-shaped printed matter 1S. Above the saw cylinder 2 and the receiving cylinder 3, paper guide belts 4a and 4b which nip the continuous paper 1S and guide them between them are stretched over, and below the cut paper 1S, A transport belt 6a for transporting toward an impeller of a paper ejection device not shown,
6b. Further, below the saw cylinder 2 and the receiving cylinder 3, paper guides 5a and 5b for guiding the cut edge of the continuous paper 1 between the transport belts 6a and 6b are provided. The tip of the paper guide 5b is formed in a skewer shape so as to enter a ring-shaped groove 9 engraved on the surface of the receiving cylinder 3.

The paper winding prevention mechanism in the cutting apparatus 10 according to the present embodiment comprises a saw paper winding prevention mechanism 21 provided on the saw drum 2 and a receiving paper winding prevention mechanism 31 provided on the receiving drum 3. Have been. As shown in FIGS. 2 to 4, the saw body winding prevention mechanism 21 includes a second passage 26 formed through the base of the saw body shaft 2 </ b> J, and one end of the saw body shaft 2 </ b> J.
A first passage 25 which is opened at the shaft end of J and the other end thereof communicates with the second passage 26, and is formed along the longitudinal direction of the saw blade assembly 22. A third passage 27 formed in the side plate 24 buried in the saw body 2B in parallel with the axis.
And one end is open to the surface of the side plate 24 and the other end is the third passage 2.
7, a plurality of small holes 28 drilled in the longitudinal direction of the saw blade 7, a pipe 29 connecting the second passage 26 and the third passage 27, and a shaft end opening of the first passage 25. Rotating joint 1
1 and an air pipe 14 connected to a compressed air source.

The above-mentioned receiving cylinder paper winding prevention mechanism 31 is shown in FIGS.
As shown in FIG. 4, a second passage 36 penetrating through the base of the receiving cylinder shaft 3J and a receiving member having one end open to the shaft end of the receiving cylinder shaft 3J and the other end communicating with the second passage 36. Body shaft 3J
The first passage 35 formed in the shaft center of the
A third passage 37 formed in parallel with the axis along the longitudinal direction of 2, and one end is open on the surface of the saw blade receiving attachment member 34 embedded in the receiving cylinder main body 3B, and the other end is the third passage. A plurality of small holes 38 drilled in the longitudinal direction of the saw holder 8 so as to communicate with the passage 37, a pipe 39 connecting the second passage 36 and the third passage 37, and a shaft end opening of the first passage 35. Rotating joint 11
And an air pipe 15 connected to a compressed air source through the air pipe. The air pipes 14 and 15 are provided with a single line through the respective regulating valves 17, and an electromagnetic valve 16 is disposed further upstream of the line, and an air compression source (not shown) is provided. It is connected to the. The solenoid valve 16 and the regulating valve 17 are connected to a control device, and can control the opening / closing timing of the solenoid valve 16 and the throttle of the regulating valve 17.

When the operation of the rotary press is started, the air pipes 14 and 1 are started.
When the solenoid valve 16 of the air piping system connected to the cylinder 5 is in the "open" state, the compressed air is rotated from the shaft ends of the saw cylinder 2 and the receiving cylinder 3 via the respective rotary joints 11, 2 and 3,
Flows into. Next, the compressed air is supplied to the first passages 25 and 35 and the second passages 26 and 3 in the respective cylinders 2 and 3.
6. Flow into the third passages 27 and 37 via the pipes 29 and 39,
From the small hole 28 of the saw cylinder 2 toward the saw blade 7, the receiving cylinder 3
Air is injected from the small hole 38 toward the saw blade receiver 8.

On the other hand, the continuous paper 1 which has been printed and sent to the folding section is introduced between the rotating saw cylinder 2 and the receiving cylinder 3 sandwiched between the guide belts 4a and 4b. 5A and 5B, the positions of the saw blade 7 and the saw blade receiver 8 approach each other by the rotation of the saw cylinder 2 and the receiving cylinder 3 as shown in FIGS. Thus, the air jetted from each of the small holes 28 and 38 is blown to both sides of the continuous paper 1 more strongly and at an acute angle. And
The saw blade 7 and the saw blade receiver 8 meet, and the blade edge of the saw blade 7 pierces the continuous paper 1 into the rubber saw blade receiver 8 to cut the continuous paper 1.
Immediately after the sheet is cut, as shown in FIGS. 5 (C) and 5 (D), the continuous paper 1 is vigorously sprayed toward the cut end, that is, the cut end. As a result, the air is guided in the flow direction of the continuous paper 1, so that the saw-shaped cut edge of the continuous paper 1 descends straight toward the leading ends of the transport belts 6 a and 6 b. Therefore, the cut end of the continuous paper 1 does not stick around the saw blade assembly 22 or the saw blade receiver assembly 32 and is not wrapped around the body. The strength of the air blown on the continuous paper 1 is determined in consideration of the quality of the continuous paper 1, the working environment, the cutting speed, and the like.

As described above, the paper winding prevention mechanism of the cutting apparatus according to the present invention includes a mechanism for injecting air toward the saw blade 7 and a mechanism for injecting air toward the saw blade receiver 8. Has the following effects. (B) Immediately after cutting the continuous paper 1, air is blown vigorously in a downward direction from both sides of the continuous paper 1 toward the cut.
Since the continuous paper 1 is guided in the flow direction of the air, the cut end of the continuous paper 1 descends straight and enters between the left and right transport belts 6a and 6b. Therefore, even in the case of a light paper having a weak stiffness, the cut edge of the continuous paper 1 is formed by the saw blade assembly 22 or the saw blade receiver assembly 3.
This eliminates sticking around the body 2 and wrapping around the body, thereby improving productivity.

(B) Since it is no longer necessary to prevent the paper from being wound by bringing the tip of the paper guide 5a as close as possible to the saw cylinder 2 as in the prior art, scratches and dirt do not occur on the stamp surface.
It is possible to always discharge a stable quality print. In addition, even when the behavior of the leading edge of the cut edge is adjusted according to the paper quality, since the remote control can be easily performed by the adjusting valve 17 during operation, the operation and adjustment of the machine become extremely easy.

Next, a second embodiment of the present invention will be described. As shown in FIG. 6, the paper winding prevention mechanism in the cutting apparatus according to the present embodiment includes a water pipe 42 and a compressed air pipe 43 in the air piping system in the configuration of the paper winding prevention mechanism of the cutting apparatus according to the first embodiment. And a spray gun 41 provided with a spray gun. That is, the air pipe 1
A spray gun 41 is provided between the adjustment valve 17 and the electromagnetic valve 16 provided on the upstream side of the spray guns 4 and 15. In addition, the cutting device is provided with a control device (not shown) for controlling the opening / closing timing of the electromagnetic valves 16, 44, and 45 provided in each conduit and the throttles of the adjustment valves 17, 46, and 47.

When the operation of the rotary press is started, the air pipe 1
When the electromagnetic valve 16 of the air piping system connected to the spray guns 4 and 15 is opened, and the electromagnetic valves 44 and 45 of the compressed air piping 42 and the water piping 42 connected to the spray gun 41 are opened. Then, spray water is sprayed from the spray gun 41 into the air pipes 14 and 15. Air piping 14,1
The atomized water injected into the pipe 5 is mixed into the air flowing through the pipe, and is introduced into the respective cylinders 2 and 3 rotating from the shaft ends of the saw cylinder 2 and the receiving cylinder 3 through the respective rotary joints 11. Inflow.
The air mixed with the mist of water flowing into the saw cylinder 2 and the receiving cylinder 3 passes through the respective passages shown in the above-described first embodiment, and passes through the small holes 28 of the saw cylinder 2 to form the saw blade 7. Is ejected from the small hole 38 of the receiving cylinder 3 toward the saw blade receiver 8. Then, the continuous paper 1 traveling between the saw cylinder 2 and the receiving cylinder 3
Is humidified by atomized water mixed into the air to be blown.

Therefore, in addition to obtaining the same operation and effect as in the first embodiment, the static electricity charged on the continuous paper 1 through the dryer and various rollers is removed by humidification. For this reason, even if the operating speed, the temperature of the dryer, or the environment such as the indoor temperature and humidity change, the behavior of the paper does not change due to static electricity, and a stable printing operation including the post-process can be always performed. Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the small hole 2
Although a plurality of 8, 38 are provided in the axial direction of the saw cylinder 2 and the receiving cylinder, one or more gap-shaped members may be provided instead of small holes.

[0017]

As described above, according to the paper winding preventing mechanism of the cutting apparatus of the present invention, a mechanism for jetting air toward the cutting end of the continuous paper is provided in the saw cylinder and the receiving cylinder. After the continuous paper is cut, the continuous paper descends straight by blowing air on the continuous paper, and enters between the transport belts in the next process. Therefore, the continuous paper is not wrapped around the saw blade or the saw blade receiver, and the productivity of printed matter is improved. As in the past, it is no longer necessary to keep the leading edge of the paper guide as close to the saw cylinder as possible to prevent paper winding.Therefore, there is no rubbing or dirt on the stamp surface, and it is possible to always output stable quality printed matter. it can.

Further, an air piping system constituting an air injection mechanism is provided with an electromagnetic valve for discharging air immediately after cutting the continuous paper, and a control device for controlling the opening / closing timing of the electromagnetic valve. Air can be jetted immediately after cutting the continuous paper. Therefore, even when the behavior of the leading edge of the cut edge is adjusted according to the paper quality, the remote operation can be easily performed by the adjusting valve during the operation, so that the operation and adjustment of the machine become extremely easy. Furthermore, by providing a device that sprays water in the form of a mist in the air piping system, even if static electricity is charged on the continuous paper during operation of the device, it may become wrapped around the saw cylinder or receiving cylinder due to humidification. Absent.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the periphery of a saw cylinder and a receiving cylinder of a cutting apparatus according to a first embodiment of a paper winding prevention mechanism of the cutting apparatus of the present invention.

FIG. 2 is a partially cutaway plan view of the cutting device according to the first embodiment of the paper winding prevention mechanism of the cutting device of the present invention.

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is a sectional view taken along line YY in FIG. 2;

FIGS. 5A to 5D are cross-sectional views for explaining an operation state of a paper winding prevention mechanism of the cutting apparatus of the present invention.

FIG. 6 is a plan view of a cutting device according to a second embodiment of the paper winding prevention mechanism of the cutting device of the present invention.

FIG. 7 is a perspective view of the periphery of a saw cylinder and a receiving cylinder of the cutting device of the paper winding prevention mechanism of the conventional cutting device.

FIG. 8 is a cross-sectional view for explaining an operation state of the cutting device of the paper winding prevention mechanism of the conventional cutting device.

[Explanation of symbols]

 Reference Signs List 1 continuous paper 2 saw cylinder 3 receiving cylinder 7 saw blade 8 saw blade receiver 10 cutting device 14, 15 air pipe 16, 44, 45 solenoid valve 25, 35 first passage 26, 36 second passage 27, 37 first 3 passages 28,38 Small hole 41 Spray gun 43 Water pipe

Claims (3)

[Claims] 1. A saw cylinder having a substantially cylindrical shape and having a saw blade on its surface, and a receiving cylinder having a substantially cylindrical shape and having a saw blade receiver on its surface. In a cutting device in which a cylinder and a receiving cylinder are arranged adjacent to each other with their central axes parallel to each other and the continuous paper is cut to a predetermined length by rotation of the saw blade and the receiving cylinder, the surface of each of the saw cylinder and the receiving cylinder is provided. A mechanism for injecting air from the portion toward the cutting end of the continuous paper is provided inside the saw cylinder and the receiving cylinder, and the continuous paper is wound around the surfaces of the saw cylinder and the receiving cylinder by the air. A paper winding prevention mechanism for a cutting device, wherein 2. An air piping system constituting the mechanism for injecting air is provided with a solenoid valve for ejecting air immediately after cutting the continuous paper, and a control device for controlling the timing of opening and closing the solenoid valve. The paper winding prevention mechanism of the cutting device according to claim 1, further comprising: 3. The paper winding prevention mechanism of the cutting device according to claim 1, wherein a device for spraying water in a mist state is provided on the air piping system, and the continuous paper is humidified for preventing static electricity. .