JPH049147B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for controlling the tension of running paper in a rotary printing press.

(Prior art) In a rotary printing press, if the tension of the running paper is too low,
Meandering and excessively high tension may cause wrinkles and paper breakage, so it is necessary to adjust the tension value of the running paper within an appropriate range in each part of the rotary printing press.

The outline of a tension control device for running paper in a conventional rotary printing press will be explained with reference to FIG. 4. 1 is a plurality of reel stands, and the running paper 2 attached to each reel stand 1 is connected to an infeed roller 11 a dancer roller 10 and reaches each printing unit 3 through
It is printed here, passes through the guide roller 4 intermediate drag roller 5, reaches the triangular plate top drag roller 6, is pressed here by the triangular plate drag presser roller 7, is sent to the triangular plate 8, is conveyed to the nipping roller 9, and then , cut into pieces and ejected from the machine. On the other hand, an appropriate load is applied to the dancer roller 10 at the entrance portion via a load device 12, and pressing devices 13 and 1 are applied to the triangular plate drag press roller 7 and nipping roller 9 at the exit portion, respectively.
Appropriate pressing force is applied via 4, and the tension of the running paper 2 is controlled by operating these load devices 12 and pressing devices 13, 14.

(Problems to be Solved by the Invention) In the running paper tension control device in the rotary printing press shown in FIG.
4, and the tension of each running paper 2 is controlled via the dancer roller 10, the triangular plate drag press roller 7, and the nipping roller 9. However, the tension of each running paper 2 is controlled by the system of each printing unit 3. There is no known method for adjusting the tension, and skilled operators manually operate the loading device 12 and pressing devices 13, 14 based on their experience, and automation is desired.

(Means for Solving the Problems) The present invention satisfies the above-mentioned requirements, and is provided in a rotary printing press having a mechanism for conveying a plurality of sheets of paper in a stacked manner on rollers. The tension of each running paper that has reached the exit section through the exit section is detected at the same exit section, and the predetermined tension of the running paper at the entrance of each printing unit is determined based on the detected value obtained at that time, taking into account the mutual interference of each running paper. The present invention relates to a method for controlling the tension of a running paper in a rotary printing press, which is characterized in that the tension of the running paper at the inlet of each printing unit is adjusted to a constant value based on the calculation result, and its purpose is to: The object of the present invention is to provide an improved tension control method for running paper in a rotary printing press that can automatically control the tension of each running paper to an appropriate value.

(Example) Next, the method for controlling the tension of running paper in a rotary printing press according to the present invention will be explained using the tension control device for running paper in a rotary printing press shown in FIG. 1, which is used to implement the method. , the running paper 2 mounted on each reel stand 1 passes through an infeed roller 11 and a dancer roller 10, reaches each printing unit 3, is printed on, and is further transferred to a guide roller 4.
It reaches the drag roller 6 on the triangular plate via the intermediate drag roller 5, where it is pressed by the triangular plate drag presser roller 7 and sent to the triangular plate 8, and then conveyed to the nipping roller 9, after which it is cut and discharged from the machine. Ru. On the other hand, the dancer roller 1 at the entrance
0 is applied with an appropriate load via a load device 12, and the triangular plate drag press roller 7 and the nipping roller 9 at the exit section are provided with a press device 13, respectively.
A suitable pressing force is applied via 14. Although FIG. 1 shows a case where there are three reel stands 1, the number is not limited to three. Also 1
5 is a tension detection device, 16 is a calculation device, 17, 18
19 is a pressing force control device, and 19 is a load force control device, which detects the tension of the running paper 2 between the intermediate drag roller 5 and the triangular plate drag roller 6 with a tension detection device 15, and sends the detection signal obtained at that time to a calculation device. 1
At the same time, the load signal of the dancer roller 10 is sent to the calculation device 16, and in the calculation device 16,
The following calculations are performed from these signals to calculate the amount of operation for the load device 12 and pressing devices 13 and 14, and the control signals obtained as a result are sent to the load control device 19 and pressing force control devices 17 and 18. , the load force of the load device 12 is adjusted via the load control device 19, and the pressing force of the pressing forces 13, 14 is adjusted via the pressing force control devices 17, 18.

(Function) Next, the function of the running paper tension control device in the rotary printing press will be explained. First, calculations performed by the calculation device 16 will be explained. Figures 2 and 3 show the case where there are three reel stands 1', 1'', and 1, and the running paper 2
This figure shows the case where the intermediate drag roller 5 does not slit. Now, the tension in front of the triangular plate 8 of the running paper 2 from the reel stand 1' is T ₁ (Kg) (measured value), and the tension in front of the triangular plate 8 of the running paper 2 from the reel stand 1'' is T ₂ (Kg) (measured value). value), the tension in front of the triangular plate 8 of the running paper 2 from the reel stand 1 is T ₃ (Kg) (measured value), and the tension of the running paper 2 in front of the printing unit 3 from the reel stand 1' is T _0,1 ( Kg) (value to be controlled),
The tension in front of the printing unit 3 of the running paper 2 from the reel stand 1'' is T _{0,2 (Kg) (value to be controlled), and the tension in front of the printing unit 3 of the running paper 2 from the reel stand 1 is T 0,2} (Kg) (value to be controlled).
The previous tension is T _0,3 (Kg) (value to be controlled), the friction coefficient between the intermediate drag roller 5 and the running paper 2 is μ (-) (constant), and the pressing force of the triangular drag presser roller 7 and Nitsupigroller 9 is corrected. The value is ΔF (Kg), and the overall elastic modulus of the running paper 2 in front of the printing unit 3 is E ₀ (Kg/cm).
(constant), the overall elastic modulus of the running paper 2 after printing unit 3 is E (Kg/cm) (constant), the width of the running paper 2 is a
(cm) (constant), first reel stand 1',
Tension in front of triangular plate 8 of running paper 2 from 1″, 1
Add up T ₁ , T ₂ , T ₃ and calculate the total value and set value 〓T
The magnitude of the pressing force correction value ΔF of the triangular plate drag press roller 7 and the nipping roller 9 is calculated by dividing the deviation from the friction coefficient μ by the friction coefficient μ. Next, the tension T ₃ of the reference running paper 2 (in this case, the running paper 2 from the reel stand 1) and each of the other running papers 2
Deviation from tension T ₁ and T ₂ (T ₁ − _{T 3} ), (T ₂ − _{T 3} )
is the overall elastic modulus E of the running paper 2 after printing unit 3.
divided by (T ₁ - T ₃ )/E, (T ₂ - _{T 3} )/E
Calculate. On the other hand, the tensions T 0,1 , T _0,2 of the running paper 2 from the reel stands 1', 1 _' ' in front of the printing unit 3
(T _0,1 - _{T 0,3} ), (T _0,2 - _{T 0 ,3} ) by the overall elastic modulus E ₀ of the running paper 2 in front of the printing unit 3, (T _0,1 −T _0,3 )/E ₀ , (T _0,2 −T _0,3 )/ Calculate E ₀ . Then the difference between these, (T _0,1 −T _0,3 )/E ₀
−(T ₁ −T ₃ )/E ₀ , (T _0,2 −T _0,3 )/E ₀ −(T ₂ ,
Perform the calculation a1/E _{0 0} 1 0 1/E ₀ 1 -1/E ₀ -1 _{/ E 0} 1 ^-1 | | , reel stand 1', 1', 1
The tension T _0,1 of the running paper 2 before the printing unit 3 from
Calculate T _0,2 and T _0,3 (values to be controlled). Furthermore, the value to be controlled T _0,1 obtained by the arithmetic unit 16,
T _0,2 and T _0,3 are sent as control signals from the calculation device 16 to the load device 12 of each dancer roller 10,
The air pressure of the load device 12 is controlled, and the triangular plate 8 of the running paper 2 from the reel stands 1', 1'', 1 is
The previous tensions T ₁ , T ₂ , T ₃ are adjusted constant. In other words, in the present invention, when the running papers 2 that have originally passed through the printing units 3 having different circumferential speeds are stacked and conveyed all at once by the triangular plate front drag rollers 6 and 7, the running papers 2 that have different circumferential speeds may have different values. The tension of both rollers is made the same by adjusting the air pressure of the dancer roller 10. Next, the principle of this point will be specifically explained. Running paper 2, which is now the standard
The speed at which the paper (in this case, the running paper 2 from the reel stand 1) passes through the printing unit 3 is V ₀ (cm/s),
The speed at which the other running paper 2 (in this case, the running paper 2 from the reel stand 1'1'') passes through the printing unit 3 is V (1 + α _i ) (cm/s), and the drag roller on the triangular plate of all the running paper 2 The passage speed of the 6th section is v ₀ (cm/
s), the strain of the reference running paper 2 before the printing unit 3 is ε _0,3
(-), the distortion of the other running paper 2 in front of the printing unit 3 is ε _0,3 (-), the distortion of the standard running paper 2 at the drag roller 6 section on the triangular plate is ε(-), i=1,2 Then, for the standard running paper, according to the law of conservation of mass, v (1-ε ₃ ) = V ₀ (1-ε ₀ ) ... For each running paper, according to the law of conservation of mass, v (1-εi) - V ₀ (1+ _αi )(1- _εp , _i )...Here, the speed at which the running paper 2 passes through the three printing units is the same as the circumferential speed of the printing unit 3, and the circumferential speed varies among the printing units 3. Therefore, with respect to the peripheral speed V ₀ of the printing unit 3 through which the reference running paper 2 passes, the peripheral speed of the printing unit 3 through which each of the other running papers 2 passes is set as V ₀ (1+αi). However, α _i <<1. Further, in the triangular plate drag roller 6 section, all the running papers are pressed by the presser roller 7 and move as one, so the speed v is common to all the running papers 2. From the above formula and more, 1-ε _i /1-ε ₃ = (1+α _i )(1-ε _p,i )/1-
ε _0,3 ≒1+α _i −ε _p,i /1−ε _0,3 …… Since ε≪1 and ε ₀ ≪1, the formula approximates the formula.

1−ε _i +ε ₃ ≒1+α _i −ε _0,3 ... ∴α _i = (ε _p,i −ε _0,3 )−(ε _i −ε ₃ ) ... On the other hand, on the triangular plate of each running paper 2 The tension T _i in front of the drag roller 6 is expressed by the following equation.

T _i = aEε _i3 ... Similarly, T ₃ = aEε ₃ ... T _0,3 = aE ₀ ε _0,3 ... T _p,i = aE ₀ ε _p,i ... ... Substitute the expression into the equation. α _i = 1/aE ₀ (T _p,i − T _0,3 )−1/aE (T _i −T ₃ )... In other words, the equation is based on the tension value of the printing unit 3 through which each running paper 2 passes. This shows that it is possible to calculate variations in circumferential speed.

On the other hand, from the formula, ε _0,1 −ε _0,3 = ε ₁ −ε ₃ +α ₁ ... ε _0,2 −ε _0,3 = ε ₂ −ε ₂ −α ₂ ... Here, before printing unit 3 The total tension of the running paper 2 is given as ₃ 〓 ⁱ⁼¹ _0,i = aC=constant value... By substituting the equation into the equation, α _i = 1/aE0 (T _p,i = T _0,3 )−1/aE(aEε _i −a
Eε ₃ )=1/aE ₀ (T _p,i −T _0,3 )−(ε _i −ε ₃ ) ∴1/E ₀ (T _p,i −T _0,3 )=a{(ε _i − ε ₃ ) + α
_i } When i=1, 1/E ₀ (T _0,1 −T _0,3 ) =a{(ε ₁ −ε ₃ )+α ₁ } When i=2, 1/E ₀ (T _{0, 2} −T _0,3 ) = a {(ε ₂ −ε ₃ )+α ₂ } From the formula (T _0,1 +T _0,2 +T _0,3 )=aC From the above formula 1/E ₀ 0 1 0 1/ E ₀ 1 -1/E ₀ -1/E ₀ 1T _0,1 T _0,2 T _0,3 =a (ε ₁ -ε ₃ )+α ₁ (ε ₂ -ε ₃ )+α ₂ C... Therefore Using the value of α _i calculated by the formula, ε ₁ = ε ₂
In order to make = ε ₃ , T _0,1 T _0,2 T _0,3 =a1/E ₀ 0 1 0 1/E ₀ 1 -1/E ₀ -1/E ₀ 1 ^{- 1} ｜ ｜ 〓 α ₁ α ₂ C …… It is sufficient to create a tension before the printing unit 3. As a result of the above, the tension in front of the triangular plate 8 of all the running papers 2 becomes the same. By the way, the total value of the tension in front of the triangular plate 8 is equal to the frictional force μF given by the drag roller 6 and the nipping roller 9 on the triangular plate.

₃ 〓 ⁱ⁼¹ T _i μF ... Here, F is the pressing force (Kg) of the triangular plate drag press roller 7 and the nipping roller 9. Therefore, the absolute value of the tension in front of the triangular plate 8 can be adjusted by changing the pressing force F.

Effects of the Invention As described above, the method for controlling the tension of running paper in a rotary printing press according to the present invention detects the tension of each running paper that has reached the outlet via each printing unit from each inlet, and The predetermined tension of the running paper at the entrance of each printing unit is calculated based on the detected value obtained at the time, taking into account the mutual interference of each running paper, and based on the calculation result, the tension of the running paper at the entrance of each printing unit is calculated. The tension is adjusted to a constant value, which has the effect of controlling the tension of each running paper to an appropriate value.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an example of a tension control device used in an embodiment of the tension control method for running paper in a rotary printing press according to the present invention, Fig. 2 is an explanatory diagram of the operation of the calculation device, and Fig. 3 is the above FIG. 4 is a system diagram showing a tension control device for running paper in a conventional rotary printing press. 1', 1'', 1... Entrance section, 2... Running paper, 3
...Printing unit, 16...Arithmetic unit T ₁ , T ₂ ,
T ₃ ... Tension of the running paper 2 detected at the exit section, T _0,1 ,
T _0,2 , T _0,3 ... Tension of the running paper at the entrance.

Claims (1)

[Claims] 1. In a rotary printing machine having a mechanism for conveying multiple sheets of paper in a stacked manner on rollers, the tension of each paper running from each inlet, passing through each printing unit, and reaching the outlet is detected at the same outlet, Based on the detected value obtained at that time, a predetermined tension of the running paper at the entrance of each printing unit is calculated, taking into account the mutual interference of each running paper, and based on the calculation result, the tension of the running paper at the entrance of each printing unit is calculated. A tension control method for running paper in a rotary printing press, characterized by adjusting the tension to a constant value.