JP2500409Y2 - Rotary printing machine Paper feed tension control device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tension control for a rotary printing press, which holds the tension of a running paper at the time of power failure and prevents the running paper from breaking and secondary troubles caused by the breaking. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, when performing rotary printing of newspapers and the like,
The winding paper is unwound by a running belt drive and is fed to a rotary printing press with a certain tension.
That is, when the paper is fed, the tension of the paper feed is controlled and the tension is supplied to the rotary printing press.

FIG. 4 is a schematic view showing the structure of a conventional tension control device for feeding a rotary printing press. The example in FIG. 4 has a web 1 to be printed, and a running belt drive 3 for unwinding the web 1 as a running paper 2 and applying a constant tension. Further, a rotary printing machine 4 for printing, a main electric motor 5 for rotationally driving the printing cylinder 4a, etc., a rotary printing machine drive shaft 5a, and a step roller 7 that moves up and down depending on the tension of the running paper 2. A position detector 7a for detecting the position of the step roller, and
Tension controller 8 and running belt drive motor 9
And have.

In this structure, first, in order to keep the tension of the running paper 2 unwound from the web 1 placed in the paper feed section of the rotary printing machine 4 constant, it is provided at the outlet of the paper feed section. A feedback signal from the position detector 7a of the step roller 7 is input to the tension controller 8. The tension controller 8 compares the feedback signal with a preset position reference value and changes the rotation speed of the running belt drive motor 9 that drives the running belt drive device 3 to rotate to the reference position.

Due to this change in the number of revolutions, the surface speed of the paper roll 1 is changed to change the amount of unraveling of the paper roll 1 to keep the tension of the running paper constant. When a power failure occurs in this state, the rotary printing press 4 is decelerated by a mechanical load and naturally stops. In this case, the tension controller 8 for applying a constant tension to the running paper 2 unwound from the winding paper 1 is in an uncontrolled state because it is an electronic type, and the running belt drive motor 9 is also in a stopped state. Therefore, the tension of the running paper 2 unrolled from the web 1 is reduced.

For this reason, the running paper 2 is loosened in a large amount due to the influence of the inertial force of the winding paper 1 and meanders, and the peripheral paper is contacted and cut. Further, due to this paper breakage, secondary troubles such as winding of the printing cylinder 4a of the rotary printing press 4 and paper jamming in the folding machine occur.

[0007]

As described above, in the above-described conventional tension control device for feeding the rotary printing machine, when the running paper 2 is broken, the printing cylinder 4 of the rotary printing machine 4 is cut by the breaking.
Trouble of body winding at a and paper jamming at the folding machine occurs. That is, a secondary trouble is likely to occur, which may reduce work efficiency and damage the machine.

The present invention has been made in view of the above-mentioned circumstances, and is capable of holding the tension of the running paper at the time of a power failure and preventing the running paper from breaking and secondary troubles caused by this breaking. An object is to provide a tension control device for feeding a printing press.

[0009]

In order to achieve the above-mentioned object, a tension control device for feeding a rotary printing press, which controls the feeding tension when feeding the roll paper of the present invention to a rotary printing press, has a power failure. A power failure detector that detects the power failure, a connection mechanism that operates in conjunction with the power failure detection of the power failure detector, an input shaft that is connected to the rotary drive shaft of the rotary printing press, a control shaft, and a running belt drive device. A continuously variable transmission connected to the output shaft, and when the power failure occurs, the connection mechanism is operated to connect the input shaft and the control shaft, and the output shaft of the continuously variable transmission is connected to the input shaft by a predetermined distance. While rotating at a rate, the running belt driving device is rotationally driven by the rotation speed of the output shaft to maintain the tension of the paper roll, and preferably, the connection mechanism is compressed when the power failure detector operates. Solenoid valve through which air flows , Compressed air from the solenoid valve are constituted by a pneumatic clutch that operates supplied.

[0010]

The tension control device for paper feeding of the rotary printing press of the present invention having the above-mentioned structure is a control shaft of a continuously variable transmission and a rotary printing press by a relatively inexpensive connection mechanism such as a solenoid valve and a pneumatic clutch at the time of power failure. The input shaft connected to the drive shaft of is connected.
The rotation speed of the output shaft of the continuously variable transmission is mechanically controlled in proportion to the speed of the rotary printing press, and the running belt driving device is rotationally driven by this control to unwind the web.

Thus, the speed of the surface of the web at the time of power failure is held in proportion to the rotational speed of the rotary printing press at a certain ratio, and tension is applied to the running paper that is unwound from the web to cause inertia of the web. It suppresses the force and keeps the tension of the running paper at the time of power failure, and prevents secondary troubles such as running paper breakage and paper jam caused by this breaking.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the feeding tension control device for a rotary printing press of the present invention will be described with reference to the drawings. FIG.
[Fig. 3] is a schematic view showing a constitution of an example. In the following text and drawings, the same components as those in the previous FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG.
This example has a web 1 for printing, a running paper 2 on which the web 1 is unwound, and a belt for unwinding the web 1 and applying tension to the running paper 1 that is unwound. It has a running belt drive device 3.

Further, it has a main electric motor 5 for rotationally driving the printing cylinder 4a of the rotary printing press 4 and the like, and a drive shaft 5a attached to the main electric motor 5 for transmitting rotation through a bevel gear. In addition, the continuously variable transmission 6 to which the rotation of the drive shaft 5a is transmitted, and the input shaft 6a for transmitting the rotation to the continuously variable transmission 6 through the bevel gear that transmits the rotation of the main motor 5
And an output shaft 6b from the continuously variable transmission 6 for rotationally driving the running belt drive device 3, and a control shaft 6c for controlling the ratio of the rotational speed of the output shaft 6b to the rotational speed of the input shaft 6a. It is provided.

Further, the step roller 7 in which the roller moves up and down due to the difference in tension of the running paper 2, the position detector 7a for converting the position displacement of the step roller 7 into a detection signal, and the feedback detected by the position detector 7a. A tension controller 8 for controlling the rotation speed of an electric motor 9 that rotationally drives a control shaft 6c of the continuously variable transmission 6 by a signal, and the continuously variable transmission 6
And a motor 9 for driving the control shaft 6c of the motor. Further, a pneumatic clutch 10 connecting the control shaft 6c of the continuously variable transmission 6 and the input shaft 6a, a solenoid valve 11 for turning on / off the pneumatic clutch 10, and a power failure detection for detecting a power failure. And a container 12.

Next, the operation and function of this configuration will be described. In normal times, the main motor 5 is the printing cylinder 4a of the rotary printing press 4.
Is driven to pull the running paper 2, and the step roller 7 is raised. The tension controller 8 compares the feedback signal from the position detector 7a attached to the step roller 7 with a preset position reference value, and drives the control shaft 6c of the continuously variable transmission 6 to reach the reference position. A motor rotation speed command signal is output to the motor 9.

Solenoid valve 1 for turning on / off the pneumatic clutch 10.
1 is a pneumatic clutch 10 because it is normally excited.
Does not operate, and the input shaft 6a of the continuously variable transmission 6 and the control shaft 6c are not connected. When the control shaft 6c of the continuously variable transmission 6 is rotationally driven by the electric motor 9, the output shaft 6b of the continuously variable transmission 6 receives the rotation speed from the drive shaft 5a of the rotary printing press 4 as an input. The input shaft 6a rotates at a rotation speed proportional to a predetermined ratio.

FIG. 2 is a sectional view showing a detailed structure of the continuously variable transmission 6. In FIG. 2, the continuously variable transmission 6 is composed of a combination of three mechanisms including an input shaft 6a side, an output shaft 6b side, and a control shaft 6c side. As the continuously variable transmission 6, a harmonic drive (registered trademark) manufactured by Harmonic Drive Systems Co., Ltd. was used.

This harmonic drive has an input shaft 6a.
A rigid ring is used on the side, and there are spline-shaped teeth on the inner periphery thereof, and the number of teeth of this tooth is two more than that of the ring on the output shaft 6b side. The output shaft 6b side has a thin cup shape made of an elastic body made of special steel, and spline-shaped teeth are engraved on the outer periphery of the opening side of the cup. The control shaft 6c side is composed of an elliptical plug and a ball bearing fitted on the outer periphery of the plug, so that the whole is oval.

The relationship between the input shaft 6a, the output shaft 6b and the control shaft 6c of the continuously variable transmission 6 and the number of revolutions thereof is expressed by the following equation (1). ND = NS * (R + 1) / R- (NW / R) (1) ND: rotation speed of output shaft 6b NS: rotation speed of input shaft 6a R: speed ratio NW: rotation speed of control shaft 6c

The output shaft 6b of the continuously variable transmission 6 drives the running belt drive device 3. As a result, the web 1 is rotated and the running paper 2 is unwound. Due to the amount of travel of the running paper 2 pulled by the printing cylinder 4a of the rotary printing press 4, the step roller 7 moves down when the amount of unwinding of the web 1 is large. The position of the step roller 7 is input to the tension controller 8 as a feedback signal from the position detector 7a attached near the step roller 7.

The tension controller 8 again outputs a motor rotation speed command signal of a value that is compared with a preset position reference value and becomes the reference position to the electric motor 9 that drives the control shaft 6c of the continuously variable transmission 6. The rotation speed of the running belt drive device 3 (the rotation speed of the output shaft 6b of the continuously variable transmission 6) is controlled by the value of the motor rotation speed command signal so that the position of the step roller 7 becomes the reference position. As a result, the position of the step roller, that is, the tension of the traveling paper 2 is kept constant.

Next, the case where a power failure occurs will be described. When a power failure occurs, the power failure detector 12 operates, and at the same time, the solenoid valve 11 is de-energized and the pneumatic clutch 10 operates. By this operation, the input shaft 6a to the continuously variable transmission 6 and the control shaft 6c are connected through the bevel gear 5b connected to the drive shaft 5a. As a result, the rotational speed of the output shaft 6c of the continuously variable transmission 6 is mechanically controlled in proportion to the speed of the rotary printing press 4. By this control, the rotation speed of the running belt drive device 3 connected to the output shaft 6c of the continuously variable transmission 6 is proportionally controlled to the speed of the rotary printing press 4 at a predetermined ratio, so that the inertial force of the web 1 is suppressed. It is possible to apply tension to the running paper 2 that is unwound from the winding paper, and prevent breakage of the running paper 2 due to slack during power failure.

Next, an example of calculation for determining the number of revolutions of the output shaft 6b of the continuously variable transmission 6 (the number of revolutions of the running belt driving device) for obtaining the tension on the running paper 1 will be described. Here, the following conditions are added to facilitate the calculation. (A) Diameter of printing cylinder 4a (D1) = diameter of running belt drive (D0) (b) Rotational speed of printing cylinder 4a (N1) = Rotational speed of input shaft 6a of continuously variable transmission 6 (NS) ( C) Speed ratio (R) of the continuously variable transmission 6 = 101 When the peripheral speed of the running belt driving device 3 is set to X = 99% of the peripheral speed of the printing cylinder 4a in order to obtain tension, Like (D) Rotational speed of running belt device = 0.99 × rotational speed of printing cylinder 4a (N1) (e) Rotational speed of output shaft 6b of continuously variable transmission 6 (ND) =
0.99 × rotational speed of printing cylinder 4a (N1) FIG. 3 shows a continuously variable transmission 6 based on the conditions (a) to (e).
FIG. 6 is a diagram showing a relationship between the input shaft 6a, the output shaft 6b, and the control shaft 6c and the rotational speeds thereof. That is, the rotational speed (ND) of the output shaft 6b is ND = NS + (NS-NW) / R ... (2) ND / NS = 1 + (1-NW / NS) / R ... (3) Above (5) From ND / N1 = ND / NS = X = 0.99 (4) The equation (3) is represented by NW / NS = 1 (X-1) * R = 2.01 (5) when R = 101, and the rotation speed (NW) of the control shaft 6c is the input shaft 6a.
Is proportional to the number of revolutions (NS) of.

From the above, the number of revolutions of the input shaft 6a (N
By setting the ratio of the number of revolutions (NW) of the control shaft 6c to S) in advance, the number of revolutions of the output shaft 6b of the continuously variable transmission 6 (the number of revolutions of the running belt drive device 3) can be determined. Therefore, the rotational speed of the output shaft 6b of the continuously variable transmission 6 can obtain the tension on the running paper 2 at the time of power failure.

[0025]

As described above, according to the tension control device for feeding a rotary printing press of the present invention, the speed of the surface of the roll paper is proportional to the rotational speed of the rotary printing press at a predetermined ratio in case of power failure. The tension of the running paper can be suppressed by applying tension to the running paper that is unwound from the winding paper and unwound from the winding paper. This has the effect of preventing secondary troubles such as paper jams caused by paper.

[Brief description of drawings]

FIG. 1 is a schematic view showing a configuration of an embodiment of a tension control device for feeding a rotary printing machine according to the present invention.

FIG. 2 is a sectional view showing a configuration of a continuously variable transmission in FIG.

3 is a diagram showing the relationship between the input shaft, the output shaft, and the control shaft, and the number of revolutions of the continuously variable transmission shown in FIG.

FIG. 4 is a schematic diagram showing the configuration of a conventional tension control device for feeding a rotary printing press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 roll paper 2 running paper 3 running belt drive device 4 rotary printing machine 4a printing cylinder 5 main motor 5a drive shaft 5b bevel gear 6 continuously variable transmission 6a input shaft 6b output shaft 6c control shaft 7 step roller 7a position detector 8 Tension controller 9 Electric motor 10 Pneumatic clutch 11 Solenoid valve 12 Blackout detector

Claims (2)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. A rotary printing press paper feed tension control device for controlling the tension of paper feed when feeding a roll of paper to a rotary printing press, and a power failure detector for detecting a power failure, and this power failure detection. A connection mechanism that operates in tandem with the detection of a power failure of the printing press, an uninterruptible transmission in which an input shaft connected to the rotary drive shaft of the rotary printing press and an output shaft connected to the control shaft and the running belt drive device are connected. In the event of a power failure, the connection mechanism is operated to connect the input shaft and the control shaft, rotate the output shaft of the continuously variable transmission at a predetermined ratio with respect to the input shaft, and rotate the output shaft. The tension control device for feeding a rotary printing press, characterized in that the tension of the web is held by rotating the running belt drive device by a number. 2. The connection mechanism comprises an electromagnetic valve through which compressed air flows when the power failure detector operates, and a pneumatic clutch which operates by supplying compressed air from the electromagnetic valve. A tension control device for feeding the rotary printing machine described.