JPH0688685B2 - Paper feed controller for printing machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed control device of a printing machine, which is applied to paper feed control of a printing machine that performs multicolor printing such as color printing.

(Prior Art) In the paper feed control device for a printing press as described above, a method using a stepping motor as a paper feed system drive source has been proposed and implemented.

First, an outline of the configuration of the paper feed control in this stepping motor system will be described, and then the problems of the stepping motor system will be referred to.

In a cylinder system for printing an image, a cylinder encoder is directly connected to a blanket cylinder (BC) axis for transferring an image on a plate to a sheet. The cylinder encoder outputs a pulse in accordance with the rotation of the blanket cylinder.

The cylinder detection piece directly connected to the BC shaft is configured to shield the cylinder reference position detector arranged on the periphery of the BC shaft from light, and detects the reference position of the cylinder by the light shielding.

The cylinder rotation position is detected by counting the output pulses of the cylinder encoder immediately after the cylinder reference position is detected.

On the other hand, with respect to the paper feeding system, the reference position is detected by shielding the paper feeding reference position detector arranged near the paper feeding table with the paper feeding detection piece in accordance with the reciprocating movement of the paper feeding claw for feeding the paper.

The amount of movement of the paper feed claw from the paper feed reference position is determined by the number of pulses applied to the stepping motor which is the drive source of the paper feed system. The paper feed position is detected by storing this pulse number.

In the stepping motor method, when the cylinder rotation position and the sheet feeding position match, the stepping motor is provided with a pulse number that gives a movement amount equivalent to one cylinder encoder pulse. Then, when the paper feeding position is delayed, an extra pulse number for recovering the delay is given to the stepping motor, and when it is advanced, the number of pulses given is reduced. This operation is performed every time a cylinder encoder pulse is generated to control the paper feed system.

(Problems to be Solved by the Invention) In the above-described conventional device, when the cylinder system fluctuates and the cylinder rotation speed changes abruptly, it is necessary to change the stepping motor speed accordingly. May occur. Once step-out occurs, subsequent position control becomes impossible.

In order to take the above measures, it is necessary to suppress the load fluctuation of the cylinder system (ink-containing system) as much as possible, but this causes considerable restrictions on the design of the cylinder system, and the cost increases for reducing the load fluctuation.

Therefore, in order to solve the above-mentioned problems, a DC motor that does not cause step-out is used, and there is no need to change the mechanism drastically compared with the conventional method, and the control system has excellent followability. It is desirable that the stepping motor can be replaced with a DC motor while satisfying the respective conditions of.

An object of the present invention is to meet the above-mentioned demand, and an encoder is directly connected to a motor shaft of a paper feeding system, and a movement which is a synchronization error between at least a paper feeding speed or a cylinder speed and a paper feeding amount based on cylinder rotation. By controlling the DC motor drive voltage based on the amount difference, it is possible to provide a paper feed control device for a printing machine, which has good followability to changes in the mechanical system and which can perform highly accurate print image alignment. is there.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a paper feed control device of a printing machine according to the present invention is configured as shown in FIG.

A printing machine to which the paper feed control device according to the present invention is applied is driven by a cylinder system (CS) including a printing cylinder, a drive system (ACM) that drives the cylinder system, and a direct current motor (DCM) to print the printing paper on the cylinder system. It has a paper feed system (PFS), which is mechanically separated from the cylinder drive system for feeding.

The cylinder synchronizing pulse generating means (CPG) generates a pulse synchronized with the cylinder rotation.

Cylinder reference position detection means (CPD) detects the rotation reference position of the cylinder.

The sheet feeding operation corresponding pulse generating means (PFPG) generates a pulse corresponding to the sheet conveying operation by the sheet feeding system (PFS).

The paper feed system reference position detection means (PFPD) detects the reference position of the paper feed system.

The cylinder rotation amount detecting means (CRD) obtains the cylinder rotation amount starting from the cylinder rotation reference position by counting pulses synchronized with the cylinder rotation.

The paper feed amount detection means (PFLD) obtains the paper feed amount starting from the paper feed reference position by counting the pulses corresponding to the paper feed operation.

The comparison calculation means (CCM) drives the DC motor by an output obtained by comparing and calculating the cylinder rotation amount and the sheet conveyance amount.

That is, the output of the cylinder rotation amount detection means (CRD) and the output of the paper feed amount detection means (PFLD) are input to the comparison calculation means, and the output of the paper feed amount detection means is equal to the output of the cylinder rotation amount detection means. The DC motor voltage is controlled so that

The comparison calculation means (CCM) is further composed of the following circuit parts.

First, the sheet feeding speed detecting means (PFVD) detects the sheet conveying speed, and the multiplying means (MP2) multiplies this value by a circuit part, and the DC motor voltage is controlled by the multiplication result.

Actually, in addition to the multiplication result, the difference between the output of the cylinder rotation amount detecting means and the output of the sheet feeding amount detecting means is obtained by the subtracting means (DIF), and this value is multiplied by the multiplying means (MP1) and the reference. The DC motor voltage is controlled based on the result of addition / subtraction of the output generation means (RSG) output by the addition / subtraction means (AS).

Next, after the timing calculated by the integration start timing detection means (INTSD), the subtraction means (DIF) outputs are integrated by the integration means (INT), and the multiplication means (MP3) multiplies this value by a series of circuit parts. The DC motor voltage is controlled by the multiplication result of the multiplication means (MP3). Actually, the DC motor voltage is controlled based on the multiplication result of the multiplication means (MP3), the multiplication result of the multiplication means (MP1), and the result of addition and subtraction of the output of the reference output generation means by addition and subtraction means.

Further, it has a series of circuit parts in which the cylinder speed detecting means detects the cylinder rotation speed and multiplies this value by the multiplying means (MP4), and the DC motor voltage is controlled by the multiplication result of the multiplying means (MP4). It is a thing. Actually, the DC motor voltage is controlled based on the multiplication result of the multiplication means (MP4), the multiplication result of the multiplication means (MP1) and the addition / subtraction result of the reference output generation means output (RSG) by the addition / subtraction means (AS). To be done.

Each of the multiplication means has a function of outputting a result obtained by multiplying an input of the multiplication means by a fixed number.

The respective circuit parts of the comparison calculation means described above can be arbitrarily combined. The control configuration diagram of FIG. 1 describes the case where all of them are included.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings.

The printing paper to be printed by the printing machine to which the paper feed control device according to the present invention described below is applied is a strong and resilient paper such as business card paper, postcard paper, and telephone card. . For this reason, the embodiment employs a mechanism of pushing from behind the paper with a nail.

FIG. 1 is a block diagram showing a control system of a paper feed control device of a printing machine according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a control circuit of a paper feed control device of a printing machine according to the present invention, and FIG. 3 is a circuit showing an embodiment of a DC motor drive circuit of the control circuit of the printing machine according to the present invention. 4 and 5 are waveform charts for explaining the operation of the comparator of the control circuit of the printing press according to the present invention.

FIG. 5 is a view showing the arrangement of a cylinder system, a paper feed system and related detectors of a printing machine to which the paper feed control device according to the present invention is applied. FIG. 5 (a) is a perspective view of the mechanism, and FIG. (B) is a side view.

FIG. 6 is a timing chart for explaining the operation of the control circuit of the printing press according to the present invention, and FIG. 7 is a flow chart for explaining the operation of the control system of the paper feed control device for the printing press according to the present invention. is there.

First, the mechanical section of the sheet feeding control device will be described.

In FIG. 5, the paper ejection tray 34, the paper feeding unit 28, and the ink system 35 are not shown in FIG.

A master cylinder 11 (M
C), includes a blanket cylinder 12 (BC) and an impression cylinder 13 (IC) that are wound with rubber to transfer the image on the plate.

Blanket cylinder 12 (BC) rubber (blanket)
The image is transferred on top. Impression cylinder 13
(IC) sandwiches the paper sent by the paper feed claw 24 between the blanket cylinder 12 (BC) and
The paper is discharged to the paper discharge tray 34 while applying pressure to the 12 (BC) side. As a result, the image on the blanket cylinder 12 is transferred to the paper and printing is performed.

The ink system 35 supplies ink and water to the plate on the master cylinder 11.

The paper transport motor 20 (DCM) is the drive source of the paper feed system.

The paper feed claw 24 conveys the paper 36 with the rotation of the paper conveyance motor 20 until the blanket cylinder 12 and the impression cylinder 13 add it, and then returns.

In FIG. 5, it moves in the direction of the arrow and returns to its original position.

The paper feed claw 24 feeds the lowermost sheet of the stacked sheets. Therefore, the height of the paper feed pawl 24 is lower than the thickness of one sheet of paper, and is shaped so as not to catch the upper paper when the pawl returns.

The paper supply unit 28 is arranged above the paper feed claw 24, and has a front abutment 29 at the front and a rear abutment 30 at the rear. The front abutment 29 prevents excess paper from being sent to the blanket cylinder 12 and the impression cylinder 13 when the paper is conveyed. The height can be adjusted according to the thickness of the paper, and the height is adjusted so that only the lowermost paper does not hit.

The rear abutment 30 prevents the paper from being returned when the paper feed claw 24 returns.

In this embodiment, a method is shown in which the paper is conveyed by the paper feed claws 24. In addition to this, a roller-based paper feed method, an air-feeding method, or the like can be considered. Is the same.

The cylinder system (ink-containing system) is driven by another motor (ACM) not shown.

As described above, the printing paper to be printed by the printing machine to which the present invention is applied is a paper having a certain thickness or more, such as business card paper, postcard paper, telephone card, and the like. For this reason, it can be pushed by the nail from the back to be conveyed and aligned.

Now, the positional accuracy of the image on the printing paper at the time of this alignment is generally called register accuracy, the register in the direction in which the paper is conveyed is called the vertical register, and the direction perpendicular to this is called the horizontal register. ing.

In the lateral register in this embodiment, side guides (not shown) are provided on both sides of the stacked sheets so that the sheets are blanket cylinders 12.
In addition, the lateral position of the sheet until it is pinched by the impression cylinder 13 is regulated.

The vertical registration is performed by controlling the sheet feeding amount according to the rotation position of the cylinder by the sheet feeding device of the present invention.

Registration accuracy is not a problem in single color printing, but is important in multicolor printing because overprinting is performed. The vertical register of a normal offset printing machine uses a paper impression cylinder
The paper is conveyed until it hits the gripper attached to the sheet of paper 13 until the paper is slightly ruffled, and the gripper is arranged on the cylinder so that the gripper abutment position is at the leading edge of the paper. Is added to the gripper and is conveyed in synchronization with the cylinder, thereby being regulated.

However, this method has a drawback in that the portion of the leading edge of the paper that is added to the gripper cannot be printed.

Next, each item of the claims will be described in detail with reference to FIG.

First, the sheet feeding control device (1) of the printing press corresponding to the first item will be described.

The cylinder encoder 14 is a cylinder synchronization pulse generation means that generates a pulse synchronized with the rotation of the blanket cylinder 12.

The cylinder reference position detector 16 is a blanket cylinder 12
Cylinder reference position detection means for detecting the reference position of the cylinder is formed together with the cylinder detection piece 15 fixed to the shaft of the.

The paper feed system is separated from the cylinder drive system and driven by the drive system.

A DC motor 20 (DCM) is used as a drive source, and the paper feeding system is driven by this motor.

The sheet feed encoder 21 forms a sheet feeding operation corresponding pulse generating means for generating a pulse corresponding to the sheet feeding operation by the sheet feeding system.

The means for detecting the reference position of the paper feed system is composed of a paper feed detection piece 23 that moves together with the paper feed claw 24 and a paper feed reference position detector 22.

The comparison calculation means (CCM) compares the count values of the means for counting the cylinder synchronizing pulse and the means for counting the pulse corresponding to the paper feeding operation, and performs the calculation processing. Then, the DC motor speed is controlled by controlling the voltage applied to the DC motor 20 based on the result of this arithmetic processing, and the paper feed amount is controlled in accordance with the cylinder rotation position.

By the above operation, it is possible to stably feed the paper and accurately transfer the image on the cylinder to a predetermined position on the paper.

The simplest one of the comparison calculation means is the subtraction means, which calculates a movement amount difference which is a synchronization error of the sheet feed amount based on the cylinder rotation.

Next, a paper feed control device (2) for a printing press according to claim 2 will be described.

By comparing the count values of the means for counting the cylinder synchronization pulse and the means for counting the pulses corresponding to the paper feeding operation, the arithmetic processing is performed, and the DC motor speed is controlled by controlling the voltage applied to the DC motor 20 according to the result of the arithmetic processing. The basic operation of the comparison calculation means for controlling the sheet feeding amount in accordance with the cylinder rotation position is the same as that of the sheet feeding control device (1).

The comparison calculation means (CCM) further has a means for detecting the paper feed operation speed and a means for multiplying the detection speed by a constant number. It is configured to control the applied voltage.

By the way, even in the paper feed control device (1) of the printing machine described above, no special improvement is required when the load converted into the DC motor shaft and the total moment of inertia of the motor are small and the mechanical time constant of the paper feed drive system is small. The required accuracy can be secured.

However, in order to reduce the mechanical time constant, the moment of inertia of the DC motor itself must be reduced. For this purpose, it is necessary to reduce the size of the motor while ensuring the motor output, which increases the price of the motor. Further, in order to reduce the moment of inertia of the load system, a great constraint occurs in the design of the load system. It may not be possible depending on the required accuracy.

The above problem is caused by the poor response of the paper feed drive system due to the large mechanical time constant.

Therefore, when the speed of the cylinder system fluctuates, the response is delayed even if the speed of the paper feed drive system is controlled following the fluctuation, and it becomes impossible to keep up with the fluctuation of the cylinder system and the register accuracy cannot be secured.

As a countermeasure, there is a method of uniformly increasing the frictional load on the paper feeding system. As a result, the response can be speeded up by reducing the influence of the moment of inertia in the entire load.

However, an increase in friction load leads to an increase in heat generation, and due to the heat generation, thermal expansion of drive system components distorts the meshing of gears and the like, further increasing the load, and in extreme cases, the DC motor drive capacity may be exceeded. .

In the experiment, the friction brake was installed on the DC motor shaft and the continuous feeding operation was performed. As a result, the temperature of the contact part between the motor shaft and the brake reached 100 ℃.

If the frictional load is not uniform, the influence of the moment of inertia is not uniform, and the responsiveness of the paper feeding system is not uniform. For this reason, the required responsiveness cannot be ensured in the portion where the frictional load is small, but it is difficult to apply the frictional load evenly in terms of part accuracy and assembly.

Further, the friction load may be worn due to use, and the load may fluctuate or decrease. In this case as well, the influence of the inertial load increases and it becomes impossible to secure the required responsiveness.

Furthermore, as the friction load increases, it is necessary to power up the DC motor, which leads to an increase in the motor price and an increase in the DC power supply capacity and power supply cost due to the motor power-up. Further, the heat generation of the motor also increases due to the increased load.

The present invention takes measures against the above problems. Instead of providing a brake, a brake is provided by controlling to apply a motor applied voltage that generates a DC motor output obtained by subtracting the DC motor output corresponding to the brake. As in the case, the influence of inertial load is reduced.

According to this, a DC motor with a large mechanical time constant, that is, a low-priced DC motor can be used. Since the motor output is reduced by an amount equivalent to the brake, it can be driven by a motor with a smaller output than when a brake is provided. Since the output is small, the heat generation of the motor is also reduced.

In addition, the capacity of the motor drive power supply is small, and the cost of the power supply can be reduced. Further, regarding the increase in the influence of the inertial load due to the change in the frictional resistance of the load, the control device exerts the same effect as that of the brake (friction load) in the device according to the present invention, so the degree is small, and the influence of the load change is reduced. Since it is hard to receive, restrictions on load system design are reduced and design becomes easy. At the same time, since the responsiveness is good, it can follow the speed fluctuation of the cylinder system well, so that the design of the cylinder system can be facilitated without much consideration of its load fluctuation.

Next, it will be explained that the paper feed control device (2) has better responsiveness than the paper feed control device (1) according to the formula.

Here, the paper feed control device (2) is a control system corresponding to the second claim, and can be represented by a block diagram as shown in FIG. 8 (b). Further, the paper feed control device (1) is shown in FIG.
The control system can be represented by the block diagram of.

Although it is difficult to accurately express the friction load of the DC motor with a mathematical formula, it is considered to be roughly proportional to the speed.

Therefore, it can be expressed as αω (α: friction coefficient,
ω: DC motor angular velocity) Meanwhile, the applied voltage of the DC motor is V, the induced electromotive force is Ea, the armature current (simply referred to as the motor current) is I, the induced electromotive force constant is K ₁ , the torque constant is K ₂ , and the motor is The output torque is τ, the moment of inertia of the load system and the motor itself (converted to the motor shaft) is J
Then, since the motor shaft converted load torque is αω, the following equation is established. Since the used DC motor uses a permanent magnet for excitation, it can be considered to be equivalent to a separately excited DC motor with a constant field current.

V = Ea + RI R: Armature resistance τ = K ₂ I Note that the brush voltage drop is ignored.

Ea ＝ K ₁ ω Also ignore the effect of inductance.

Jdω / dt = τ−αω From these equations, dω / dt ＋ (K ₁ K ₂ / JR ＋ α / J) ω ＝ (K ₂ / JR) V… This equation gives a response as K ₁ K ₂ / JR ＋ α / J increases. Is fast.

Therefore, the larger α (larger friction), the better the response. This is the reason why the response is improved when the brake is provided.

In the embodiment, V is not a constant DC voltage but a chopper-controlled voltage, but the average voltage is approximately regarded as a constant DC voltage, and this voltage is treated as being applied.

Further, the control is discontinuous because it is digital control, but if the sampling period is sufficiently short, the error is small even if it is approximated to a continuous system and analyzed in the same manner as analog control, so the following is treated as such.

When the DC motor rotation angle is θ, ω = dθ / dt, so the formula is d ² θ / dt ₂ + (K ₁ K ₂ / JR + α / J) dθ / dt = K ₂ V / JR When converted, s ² θ (s) + (K ₁ K ₂ / JR + α / J) s θ (s) = (K ₂ / JR)
V (s) ∴θ (s) / V (s) = (K ₂ / JR) / s {s + (K ₁ K ₂ / JR + α
/ J)} ... because this is the transfer function of the direct current motor, when directly connected to the encoder to the DC motor shaft, when the transfer function of the encoder pulse for the voltage V proportional coefficient is _{K 3 P DC (s) /} V (s ) = (K ₂ K ₃ / JR) / s {s + (K ₁ K ₂ / JR +
α / J)} If the ratio of the number of encoder pulses directly connected to the cylinder axis to the number of encoder pulses directly connected to the DC motor axis when the cylinder rotation speed and the paper transport speed are synchronized is 1: n, the paper feed control of the printing machine is performed. The basic block diagram of the control system described in the device (1) is as shown in FIG. 8 (a).

Here, K ₄ is not a constant but an arbitrary arithmetic expression, which is a general form of the block diagram of the paper feed controller (1) of the printing press.
This corresponds to the first claim.

When the transfer function P _DC (S) / P _AC (S) is calculated from FIG. 8 (a), P _DC (S) / P _AC (S) = (K ₂ K ₃ K ₄ / JR) n / {s ² + (K
₁ K ₂ / JR + α / J) s + (K ₂ K ₃ K ₄ / JR)}… The cylinder pulse can be regarded as a ramp function that increases in proportion to time when the cylinder rotation speed is constant, so the coefficient is 1
Then P _AC (S) = 1 / S ² .

If K ₁ K ₂ / JR ＋ α / J ＝ Zδ ₁ ω ₁ K ₂ K ₃ K ₄ / JR ＝ ω ₁ ² (δ ₁ : damping constant, ω ₁ : characteristic angular frequency) P _DC (S) / P _AC ( S) = ω ₁ ² n / (s ² + 2δ ₁ ω ₁ s +
ω ₁ ² ) ... (δ ₁ becomes 0 <δ ₁ <1) P _AC (S) = 1 / s ² When the input P _DC (S) is converted to the time axis, P _DC ( Find t).

From the equation, P _DC (t) is the ideal value nt and the steady-state deviation − (2δ ₁ /
It can be seen that ω ₁ ) n and the damping vibration component are included.

In order to improve the followability, it is sufficient that the damped vibrations are damped quickly, so that δ ₁ ω ₁ in the equation should be large. This corresponds to a small moment of inertia and a large friction load.

A block diagram of the control type of the paper feed controller (2) of the printing machine is as shown in FIG. 8 (b).

When the transfer function P _DC (S) / P _AC (S) is calculated, P _DC (S) / P _AC (S) = (K ₂ K ₃ K ₄ / JR) n / {s ² + (K ₁ K ₂ /
_{JR + α / J + K 2} K 3 K 5 / JR) s + (K 2 K 3 K 4 / JR)} ... where, K ₅ is a constant.

Comparing the equations, the part corresponding to ω ₁ ² has the same value, but 2
The part corresponding to δ ₁ ω ₁ is larger in the equation. That is, the latter control system (block diagram of the sheet feeding control device (2)) has faster attenuation and better response.

As described above, according to the paper feed control device (2) of the printing press, even if the object of control has a small friction load and a large moment of inertia, the responsiveness can be improved by appropriately selecting the value of K ₅ .

Next, a paper feed control device (3) of a printing machine corresponding to claim 3 will be described.

In the paper feed control device (1) of the printing machine, after a predetermined timing, the value obtained by subtracting the ideal value of the paper feed amount obtained from the cylinder rotation amount from the detected value of the paper feed amount is integrated, and the integrated value is fixed. A means for multiplying the number is provided, and in addition to the movement amount difference, the multiplication result is also added to perform arithmetic processing to control the DC motor voltage.

As can be seen from the equation, the paper feed control device (2) has a steady deviation. The existence of the steady-state deviation is a state in which the control amount is deviated from the target value by that amount and is balanced,
Speaking of the paper feed register control, it corresponds to the misregistered state.

If the required register allowable range is larger than the steady-state deviation, it is not necessary to make any particular correction, but in the opposite case, it is necessary to reduce the deviation.

As a method of reducing the steady-state deviation, to reduce the [delta] ₁ from the equation, but it can be said that it is sufficient to increase the omega _1, the response of the control system attenuation becomes poor to reduce the [delta] ₁ is deteriorated.

As a countermeasure against this, the value (deviation) obtained by subtracting the ideal value of the paper feed amount from the paper feed amount detection value is integrated, and the paper feed amount is made closer to the ideal value according to the result of multiplying the integrated value by a constant value. When the DC motor voltage is controlled to accelerate or decelerate the DC motor, the balance is lost and the value approaches the ideal value.

However, if this method is applied before the deviation converges within a certain value, the integrated value becomes large, so the integrated value remains large even after the operation to bring the paper feed amount close to the ideal value, and the paper feed amount It takes time for the integrated value after the plus and minus of the difference between the detected value and the ideal value to be reversed to cancel the integrated value before being inverted. This means that even after the plus or minus of the difference is reversed, a correction in the same direction as before the reversal will be added for a while (the direction before the reversal will be closer to the ideal value, but after the reversal will be away). The overshoot (or undershoot) after reversal becomes large, and it takes time to approach the ideal value again after reversal. That is, convergence and response become poor.

As a countermeasure against this, in the paper feed control device (3), the timing of starting the operation is taken after the difference converges within a certain value so that the integrated value does not become too large, and the plus or minus of the difference is reversed. The convergence time and responsiveness are improved by shortening the time until the subsequent integrated value cancels the integrated value before the inversion.

Here, as one method for detecting that the difference has converged within a fixed value, the convergence of the control system is investigated in advance at the design stage, the timing for sufficient convergence is determined, and this timing is set for the control device. A detection means is provided so that the above operation is performed after this timing.

Next, a paper feed control device (4) of a printing press corresponding to claim 4 will be described.

The sheet feeding control device (1) has a cylinder rotation speed detection means and a means for multiplying the rotation speed by a fixed number,
In addition to the movement amount difference, the multiplication result is also added to perform arithmetic processing to control the DC motor voltage.

Now, the printing machine rotates at a constant speed according to the set speed. However, when seen instantaneously, the rotation speed fluctuates periodically due to load fluctuation even during one rotation of the cylinder. In addition to this, if there is power supply fluctuation, the rotation speed also fluctuates as the output of the cylinder drive motor fluctuates.

In this way, for changes in the target value of the control system,
If the response of the control system is made faster, the control amount changes in accordance with the fluctuating target value, but the control method by feeding back the control amount and comparing / calculating with the target value causes a limit in responsiveness.

As an improvement method, a variation in the target value itself is detected, and the control target input is controlled according to the result of arithmetic processing of the detected value, whereby a control amount corresponding to the variation in the target value can be obtained.

In this case, since the controlled object input is controlled before the controlled variable is fed back, the followability is improved, and the allowable fluctuation value of the target value is increased. That is, the allowable load fluctuation of the cylinder system becomes large, and the design of the cylinder system becomes easy.

Next, a paper feed control device (5) of a printing press corresponding to claim 5 will be described.

In the digital control system, the sampling period is usually required to be sufficiently longer than the cylinder synchronization pulse period when counting cylinder synchronization pulses and the like as in the present invention.

If this is not done, the influence of the content error of the data at the time of sampling is large, and appropriate control cannot be performed. The data content error referred to here means the following.

For example, when about 20 cylinder synchronization pulses are counted during the sampling period, the number of pulses is 20 in the sampling period having 20 pulses and 21 in other periods because of the asynchronous nature of the sampling period and the cylinder synchronization pulse. May start. In such a case, the detected data will include an error of 5%. In a control system in which this 5% error causes a problem, the sampling period must be made longer.

If this sampling cycle is short, the detected data error is several tens of percent.
That's all.

Therefore, the sampling period needs to be a certain length or more.

On the other hand, when the sampling period is long, the discontinuity of the control operation becomes a problem. That is, when data is detected at a certain sampling timing, arithmetic processing is performed, and a control output is output, the controlled object undergoes a large state change by the next sampling timing. If the sampling cycle is short, the state change is small and can be approximated to a continuous change, but if the state change is large, the amount of change becomes discontinuous, and in this case too, appropriate control is difficult to perform.

Such a phenomenon corresponds to the case where the control circuit includes a large delay. Therefore, the response of the control system is bad.

With respect to the above problems, the present invention focuses on the fact that the register accuracy can be secured if the mutual relationship between the cylinder rotation amount and the sheet conveyance amount can be controlled to be constant, and the sampling operation is performed by the cylinder synchronization pulse.

As a result, a short sampling period can be realized, and the aforesaid asynchronism does not exist between the sampling period and the cylinder synchronizing pulse, so that the inclusion error does not exist. Therefore, controllability is improved.

The effect of the content error can be neglected by configuring the sheet feeding operation corresponding pulse generating means so that the sheet feeding operation corresponding pulse has a period sufficiently shorter than the cylinder synchronization pulse.

FIG. 2 shows an embodiment of the paper feed control device including the first to fifth claims.

Next, the respective detectors and the like provided in the mechanism section will be described with reference to FIG.

ACM9 is an AC motor that drives a cylinder system (including ink system), and DCM20 is a DC motor that drives a paper feed system.

The cylinder reference position detector 16 is a sensor for detecting the cylinder reference position for detecting the cylinder rotation amount when detecting the mutual position of the cylinder and the sheet feeding system.

The cylinder encoder 14 is an encoder attached to the axis of the blanket cylinder 12 and generates a pulse in synchronization with the rotation of the blanket cylinder 12. The paper feed reference position detector 22 is a sensor that detects the reference position of the paper feed system by detecting the detection piece 23 that moves with the movement of the paper feed claw 24.

The paper feed encoder 21 is an encoder directly connected to the axis of the DC motor 20, and generates a pulse in synchronization with the rotation of the DC motor 20.

Since the shaft of the DC motor 20 is connected to the paper feed drive system,
A pulse is generated from the paper feed encoder 21 when the paper feed system is driven, that is, when the paper is conveyed.

Next, the operation of the circuit will be described.

CPU110 is I / O102, R according to the instruction built in ROM101
AM103, DAC104, counter 105 and interrupt controller 106
And data are exchanged with each other, and data processing such as comparison calculation processing is performed based on the exchanged data.

The part surrounded by the dotted line 33 is the comparison calculation means in FIG.
It is a circuit section that fulfills each function of the cylinder rotation amount detecting means and the paper feed amount detecting means.

The ROM 101 stores an instruction for activating this circuit unit.

The RAM 103 is a storage unit for storing data used for comparison calculation in the CPU 110.

The I / O 102 is an input / output unit that outputs a drive operation drive signal and a return operation drive signal to the DC motor drive circuit 202.

The DAC 104 is a D / A converter, generates an output voltage according to the data from the CPU 110, and converts a digital quantity into an analog quantity.

The counter 105 is a circuit that counts the output pulses of the paper feed encoder 21.

The counter 105 has an initial value set by the data sent from the CPU 110 during counting, and the value being counted is read by the CPU 110.

When a signal is input to the interrupt input terminals (IR0 to IR4), the interrupt controller 106 sends the CPU 110 interrupt execution address data for notifying the occurrence of an interrupt. The CPU 110 continues the operation before the interrupt is generated after performing the interrupt operation according to the instruction from the interrupt execution address.

The IRO has the highest interrupt priority in the interrupt controller 106, and IR1, 2, 3, and 4 decrease in that order, and higher interrupts are accepted even during execution of lower interrupts.

The paper feed reference position detector 22 is mounted at a position that detects the paper feed claw interlocking detection piece 23 when the paper feed operation is not performed, and the detection piece 23 is the paper feed reference position when the paper is fed in accordance with the paper feed operation. It comes off from the detector 22. When the paper feed claw returns to the original position after the paper feed operation, the detection piece 23 is the paper feed reference position detector.
Shade 22 again. That is, the detector 22 detects the detection piece 23.

In the interrupt controller 106, the interrupt input terminals (IR0-4) are "L".
The interrupt input is detected when the level changes to “H” level. Therefore, the paper feed reference position detector 22 is a detection piece when the paper is fed.
The interrupt input terminal IR2 is configured to change from "L" level to "H" level when the 23 is disengaged from the paper feed reference position detector 22, and the interrupt input terminal IR3 is connected from IR2 via the inverter circuit. Since the detection piece 23 shields the paper feed reference position detector 22 from light, the detection piece 23 changes from "L" level to "H" level.

With the above configuration, the paper feed reference position detector 22 and the interrupt controller 106 detect the reference position and the return position of the feeding operation of the paper feed claw 24.

The triangular wave oscillator 107 outputs a triangular wave having a constant amplitude and a constant cycle.

The comparator 108 compares the triangular wave oscillator 107 output with the DAC 104 output, and as shown in FIG.
The output of the comparator 108 becomes "H" level only for a time longer than the output, and becomes "L" level in the opposite case.

The DAC104 output is determined according to the size of the data (referred to as DA value) sent from the CPU110 to the DAC104, so if the DA value is large, the "H" level ratio (duty) of the comparator 108 output.
Becomes smaller and the DA value becomes smaller, the duty becomes larger.

Figure 3 shows the details of the DCM drive circuit.

The DCM drive circuit 202 is composed of a bridge circuit of transistors Q ₁ , Q ₂ , Q ₃ and Q ₄ , and is driven by a chopper method.
The transistor Q ₁ is turned on by a signal from the I / O 102 during the feeding operation of the paper feed claw. The output of the comparator 108 is input to the transistor Q4.

Therefore, the power supply voltage is applied to the DCM 20 with the same duty as that of the output of the comparator 108, and the average value of the DCM drive voltage is calculated by the comparator 1.
08 Determined by output duty.

As described above, the voltage value applied to the DCM 20 is controlled.

Also during the paper feed claw return operation, the transistor Q2 is turned on by the signal from the I / O, the output of the comparator 108 is input to the transistor Q3, and the power supply voltage is applied to the DCM 20 at the same duty as the output of the comparator 108. In this case, the feeding claw feeding operation and DCM
Since the polarity of the drive voltage is opposite, the direction of DCM rotation is opposite to that during the feeding operation.

It is assumed that the transistor Q ₃ is off when the transistor Q ₁ is on, and the transistor Q ₄ is off when the transistor Q ₂ is on.

The ACM drive circuit 201 operates a relay, for example, according to a signal from the I / O 102, and drives the ACM 19 with a relay contact.

In addition to this, operation switches and display are connected,
It is not described because it is not directly related to the present invention.

Next, the actual control operation will be described with reference to the timing chart of FIG. 6 and the flowchart of FIG.

In FIG. 7, all the operations (a), (b), (c), and (d) are interrupt operations, and when performing the interrupt operation, the CP
U110 register save / return and interrupt enable operation are always involved, but these are not described.

It is assumed that the transistor Q ₃ is off when the transistor Q ₁ is on, and the transistor Q ₄ is off when the transistor Q ₂ is on.

When the ACM9 is rotating and parts other than the paper feeding system such as the cylinder system are operating, the DCM 20 starts to rotate at a predetermined cylinder rotation position by a paper feed start operation, and the paper transport operation is performed (Fig. 6, t). ₁ ).

The paper is conveyed by moving the paper feed claw 24, but it is 2 to 3 mm after BC12 and IC13 add the leading edge of the paper by the paper conveyance.
The paper feed claw 24 is moved by an amount corresponding to the margin amount, the DCM 20 is rotated in the reverse direction after detecting the position, and the paper feed claw is returned to the original position and stopped.

The return position is detected by the paper feed reference position detector 22 detecting the light blocking by the detection piece 23 which is interlocked with the paper feed claw 24 as described above.

These series of operations are performed during one rotation of the cylinder, and when the predetermined cylinder rotation position is reached again, the DCM 20 rotates again, and the same operation is repeated until the paper feed stop signal is output.

Now, it is assumed that the ratio of the number of cylinder encoder pulses per unit time to the number of paper feed encoder pulses when the cylinder peripheral speed and the paper feed speed match is 1: n (n is an integer).

ROM 101 is given a feed speed corresponding to the cylinder speed
A table of DA values is stored in advance.

The initial drive voltage applied to the DCM that starts rotating at a given cylinder rotation position depends on the cylinder detection speed.
It can be obtained by reading the DA value from the above table.
The cylinder speed is detected by the method described later. Similarly, the paper feed speed corresponding to the cylinder speed is also obtained from the ROM built-in table.

The above operation is not described in the flowchart.

DCM20 rotation start timing (FIG. 6 t ₁₎ is determined as the paper feed reference position than the cylinder reference position detection timing (FIG. 6 t ₃₎ (Okutoki) detection timing (FIG. 6 t ₂₎ is advanced is there.

Therefore, regarding the paper feeding operation control, the timing t ₂
Then, the paper feed reference position detection (during feeding) operation (a) is first executed.

The CPU 110 first initializes each data (step 30
1). The data referred to here are the paper feed amount, the proportional correction amount,
The integrated correction amount, the movement amount difference integrated value, and the movement amount difference, which are set to "0" by initialization.

Next, the counter 105 is initialized (step 302) and the interruption is completed. After that, it returns to the operation before the interrupt.

Each of the above data is represented as follows.

The paper feed amount is a numerical value representing the paper feed amount from the paper feed reference position by the number of paper feed encoder pulses.

The movement amount difference is a value obtained by subtracting the cylinder rotation amount from the paper feed amount, and the cylinder rotation amount is a numerical value representing the cylinder rotation amount from the cylinder reference position by the number of cylinder encoder pulses. Actually, the number of cylinder encoder pulses is multiplied by n, and this is taken as the cylinder rotation amount.

The proportional correction amount is a value obtained by multiplying the movement amount difference by a fixed number.

The moving amount difference integrated value is an integrated value obtained by integrating the moving amount difference after a predetermined timing.

The integral correction amount is a value obtained by multiplying the movement amount difference integrated value by a fixed number.

Next, at the timing t ₃ , the cylinder reference position detector 16
When the cylinder reference position is detected, the cylinder reference position detection operation (b) is executed. In this operation, the cylinder rotation amount is initialized and the cylinder rotation amount is set to "0" (step 101). After this, the interruption ends and the operation returns to the one before step 101.

By the way, the square wave oscillator 32 is
It is connected to 4 and is an interrupt with the lowest priority, and it always outputs a rectangular wave at a fixed cycle. Therefore, every time a rectangular wave is output, the interrupt operation is executed. This oscillator interrupt operation is as shown in FIG. 7 (c). Since this oscillator interrupt operation has the lowest priority, if another interrupt occurs, it will wait until the interrupt operation that occurred is completed.

First, the CPU 110 detects the feed amount by reading the value of the counter 105 counting the feed encoder pulse (step 401). Since the counter 105 is initialized in step 302 of the paper feed reference position detection (during feeding) operation (a), the paper feed amount is the paper feed encoder pulse count value after the paper feed reference position detection. The paper feed amount detecting means is the CPU 110
And the operation of the counter 105.

Next, the sheet feeding speed is detected (step 402). CPU110
Detects the paper feed amount of the time corresponding to the cycle of the rectangular wave oscillator 32 by subtracting the paper feed amount detection value at the previous interrupt operation from the paper feed amount detection value. This value becomes the paper feed speed. The sheet feeding speed detecting means corresponds to the operation of the CPU 110.

Next, the cylinder rotation amount is detected (step 403). C
The PU 110 reads from the RAM 103 the numerical value of the cylinder rotation amount obtained in step 201, which is performed in the interrupt operation when the cylinder encoder pulse is detected, which will be described later.

Next, the cylinder speed is detected (step 404). CPU11
0 subtracts the cylinder rotation amount detection value at the time of the previous interrupt operation from the cylinder rotation amount detection value, and detects the cylinder rotation amount for the time corresponding to the period of the rectangular wave oscillator. The cylinder speed detecting means corresponds to the operation of the CPU 110. This value corresponds to the cylinder speed. After this, the interrupt operation ends, and the operation returns to the operation before the interrupt.

It should be noted that in the oscillator interrupt operation immediately after the cylinder rotation amount and the counter is initialized, the feeding speed detection value and the cylinder speed detection value are negative numbers, which are erroneous values. Since this is only a minute, the effect of this on register accuracy can be ignored.

Timing t ₃ subsequent interrupt during cylinder encoder detection shown in FIG. 7 by the pulse generator of the cylinder encoder (d) operation (register control operation) is performed.

Actually, the interrupt operation by the cylinder encoder is also performed at times other than the register control operation (for example, detection of DCM start timing), but the flowchart of this part is omitted.

The CPU 110 first detects the cylinder rotation amount by adding the ratio n of the cylinder encoder pulse and the paper feed encoder pulse to the data of the cylinder rotation amount (step 20).
1). The cylinder rotation amount detecting means corresponds to the above operation.

Next, a counter that counts the paper feed encoder pulses
Scan the value of 105 to detect the feed amount (Step 2
02). Since the counter 105 is initialized in step 302 of the paper feed reference position detection (during feeding) operation (a), the paper feed amount is the paper feed encoder pulse count value after the paper feed reference position detection. The paper feed amount detecting means corresponds to the above operation.

As described above, the paper feed amount is also detected in step 401, but the data is not confused by changing the RAM address in step 202.

Next, the movement amount is detected by subtracting the cylinder rotation amount obtained in step 201 from the paper feed amount obtained in step 202 (step 203). The subtraction means corresponds to the operation of the CPU 110.

The ratio of the number of cylinder encoder pulses per unit time to the number of paper feed encoder pulses when the cylinder peripheral speed and the paper feed speed match is 1: n (n is an integer). If the cylinder rotation amount and the paper feed amount are equal in data, it means that the rotation position of the cylinder and the paper feed position are actually synchronized. Therefore, if these positions are synchronized, the movement amount difference becomes "0".
The value of the movement amount difference represents the amount of advance of the paper feed amount with respect to the cylinder rotation amount in terms of the number of paper feed encoder pulses. If the difference in the amount of movement is a negative value, it means that the paper feed is delayed.

Next, a proportional correction amount is calculated by multiplying the movement amount difference by a fixed number (KP) (step 204). The multiplication means 1 corresponds to the operation of the CPU 110.

Further, it is determined whether or not the integration is to be performed (step 205). When the cylinder rotation amount exceeds a certain value and it is determined that the integration is performed, the movement amount difference integrated value is calculated (step 206) and the integral correction amount is calculated (step 207). The integration start timing detection means, the integration means and the multiplication means 3 correspond to the operation of the CPU 110. If it does not reach the fixed value, the differential correction amount is calculated without performing the operations of steps 206 and 207 (step 208). The multiplication means 2 corresponds to the operation of the CPU 110.

The movement amount difference integrated value is calculated by adding the movement amount difference to the movement amount difference integrated value. Therefore, the moving amount difference integrated value becomes the total value of the moving amount difference after it is determined in step 205 that the integration should be performed.

When the movement amount difference is negative, subtraction is actually performed by the addition operation. Before the integration is performed in step 205, the movement amount difference integrated value is “0” because it has been initialized in step 301.

The integral correction amount is calculated by multiplying the moving amount difference integrated value by a fixed number (Kz).

Before the integration correction amount is integrated in step 205, it is "0" because the movement amount integrated value is "0".

The differential correction amount is calculated from the paper feed speed calculated in step 402 by
It is calculated by subtracting the paper feed speed obtained from the ROM built-in table that corresponds to the cylinder speed at the start of CM drive, and multiplying the subtraction result by a fixed number (Kb).

In the subtraction process described above, the DA value at the start of the CDM drive is a value that gives the paper feed speed synchronized with the cylinder. Therefore, when the paper feed speed is synchronized with the cylinder during the register control operation, the differentiation is performed. This is done because it is necessary to set the correction amount to "0".

This has to be done in this embodiment because the DA value is used as a reference and a correction amount is calculated for this reference DA value and the corrected value is output. In other words, the reference DA value is used during register control operation. R corresponding to the cylinder speed at the start of DCM drive
This is the same as shifting the sheet feeding speed obtained from the OM built-in table by a fixed number Kb and shifting the sheet feeding speed obtained in step 402 by the fixed number Kb as the correction amount. .

Therefore, this means that the operation corresponding to claim 2 is performed.

Next, the cylinder fluctuation correction amount is calculated (step 209). C
PU110 determines the DCM from the cylinder speed obtained in step 404.
A constant value (Kc
Cylinder fluctuation correction amount is obtained by multiplying The multiplication means 4 corresponds to the operation of the CPU 110.

Here, the purpose of the subtraction process is the same as the purpose of the subtraction process in step 208.
This is because the value equivalent to the value obtained by multiplying the cylinder speed at the time of DCM drive by a fixed number Kc is shifted, and the value obtained by multiplying the cylinder speed obtained in step 404 by the fixed number Kc is used as the correction amount.

Therefore, this means that the operation corresponding to claim 4 is performed.

Since the operation of step 404 uses the data of the cylinder rotation amount obtained in step 201, it means that the data of the feed encoder pulse conversion is obtained, and the cylinder speed at the time of starting the DCM drive is determined by the feed encoder pulse. If it is obtained from the converted data, it can be subtracted as it is like the operation of step 209.

Next, the output DA value is calculated (step 210). Output DA value = D
Calculated by calculating DA value at CM drive start + proportional correction amount + integral correction amount + differential correction amount-cylinder fluctuation correction amount.

As explained in FIG. 4, when the DA value increases, DCM
Is controlled to be slow, and when it is small, DCM is controlled to be fast.

Therefore, since the proportional correction amount is proportional to the amount of advance of the paper feed amount with respect to the cylinder rotation amount, when this value is positive,
It is necessary to decelerate the DCM and accelerate if negative. That is, if the proportional correction amount is positive, the DA value is large, and if it is negative, the DA value must be small. This proportional correction amount must be proportional to the movement amount difference.

In the above DA value calculation formula, the proportional correction amount is a value obtained by multiplying the movement amount difference by a fixed number K _P, and therefore satisfies the above relationship.

If the integral correction amount is positive, the feed amount of paper is ahead of the cylinder rotation amount, so it is necessary to decelerate the DCM and increase the output DA value. The opposite is true when the integral correction amount is negative. The DA value calculation formula satisfies the above relationship for the integral correction amount.

The differential correction amount is equivalent to the friction load instead of providing the friction load.
It is provided to reduce the DCM output. The output of DCM is higher at high speed rotation.

Therefore, the smaller the DA value, the larger the output. Therefore,
It is necessary to increase the DA value to reduce the DCM output.

The differential correction amount becomes large when the sheet feeding speed is high, becomes small when the sheet feeding speed is small, and becomes negative.

Output if the differential correction amount is large in the output DA value calculation formula
The DA value is increased, the DCM output is reduced, and the friction load is increased. If the differential correction amount is small, the DCM output is increased and the friction load is decreased, which satisfies the above relationship.

The cylinder fluctuation correction amount increases as the cylinder speed increases, decreases as the cylinder speed decreases, and becomes negative. When the cylinder speed increases, the paper feed speed must also increase, so the output DA value needs to be reduced, and conversely, when the cylinder speed decreases, the output DA value needs to increase. The formula for calculating the output DA value satisfies this relationship.

By calculating the output DA value as described above (step
210), the result of the comparison / arithmetic operation can be calculated. The adding / subtracting means corresponds to the operation of the CPU 110.

When the output DA value obtained in step 210 exceeds a certain range, the CPU 110 corrects the output DA value to the upper limit value or the lower limit value (steps 211 and 212). If it does not exceed the certain range, no correction operation is performed.

Then, after the operations in steps 211 and 212 are completed, the DA value finally obtained is output (step 213).

As a result, a drive voltage corresponding to the output is given to the DCM 20, and the feed amount of paper is controlled according to the DCM speed control.

After the operation of step 213 is completed, the interrupt operation is completed and the operation before the interruption is continued.

The above-described cylinder encoder detection operation of FIG. 7 (d) is executed every time a cylinder encoder pulse is generated as the cylinder rotates.

Since the cylinder encoder detection operation has a higher interrupt priority than the oscillator interrupt operation, the interrupt operation is executed with the cylinder encoder pulse generation even during the oscillator interrupt operation.

(C) and (d) above during the paper feeding operation control (registration control)
In the main routine, the control operation end timing is detected to wait for the end timing.

As described above, by controlling the paper conveyance amount (paper feed amount) in accordance with the cylinder rotation amount, it is possible to transfer the image on the cylinder to a predetermined position on the paper and obtain the necessary registration accuracy. .

As the rotation reference position of the cylinder, if the reference position detector shifts the number of cylinder encoder pulses after detecting the reference position, it is possible to shift the relative position of the image on the cylinder and the paper. The relative position can be controlled to be constant while shifting.

Therefore, the image can be transferred from any position on the cylinder to the paper, and can be used for aligning the printed image.

(Effects of the Invention) As described above, the paper feed control device for a printing press according to the present invention detects the paper feed speed of the paper feed system that operates by a mechanism independent of the cylinder system, and the DC value is adjusted according to this value. Since it is configured to control the motor voltage, the followability is greatly improved as compared with the conventional control device.

Further, since the DC motor voltage is controlled together with the integrated value of the deviation of the DC value, the accuracy of the register position of the paper can be secured.

It also detects cylinder system rotation fluctuations and adjusts to this value.
Since the configuration that controls the DC motor voltage is adopted, the followability of the paper feed system to the cylinder system is also greatly improved from this point.

Further, the image position accuracy is not dependent on the rotation fluctuation of the cylinder system, and the rotation fluctuation is compensated by the control, so that the image position accuracy can be secured even in a machine with a large load fluctuation.

Therefore, there are few restrictions on the mechanical design, the machining and assembly accuracy of parts are loosened, the C / D of the entire machine can be measured, and the mechanical design becomes easy.

Since the paper feed control device according to the present invention constitutes a control system with a closed loop system, it also has a feature that the operation is stable.

Furthermore, since a DC motor is used in the paper feeding system, there is no concern about step out and it can be applied to high-speed machines.

There is also an advantage that a low-cost motor can be used.

If a microcomputer is used as in the embodiment, control can be performed by software, so that a low-cost and high-performance control system can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control system of a paper feed control device of a printing machine according to the present invention. FIG. 2 is a block diagram showing an embodiment of the control circuit of the paper feed control device of the printing press according to the present invention. FIG. 3 is a circuit diagram showing an embodiment of the DC motor drive circuit of the control circuit of the printing machine according to the present invention. FIG. 4 is a waveform diagram for explaining the operation of the comparator of the control circuit of the printing press according to the present invention. 5 (a) and 5 (b) are a perspective view and a side view showing the arrangement of the cylinder system, the paper feed system and the associated detectors of the printing machine to which the paper feed control device according to the present invention is applied. FIG. 6 is a timing chart showing the operation of the control circuit of the printing press according to the present invention. FIG. 7 is a flow chart for explaining the operation of the control system of the paper feed controller of the printing machine according to the present invention. FIGS. 8 (a) and 8 (b) are block diagrams of the control system of the sheet feeding control devices (1) and (2) of the printing machine. 9 ... AC motor 10 ... Cylinder system 11 ... Master cylinder 12 ... Blanket cylinder 13 ... Impression cylinder 14 ... Cylinder encoder 15 ... Cylinder detection piece 16 ... Cylinder reference position detector 20 ... DC motor 21 ... Feed encoder 22 ... Feed reference Position detector 23 ... Paper feed detection piece 24 ... Paper feed claw 25 ... Belt 26 ... Pulley 27 ... Paper feed table 28 ... Paper feeding section 29 ... Front abutment 30 ... Rear abutment 32 ... Rectangular wave oscillator 34 ... Paper ejection tray 35 ... Ink system 36 ... Paper 101 ... ROM 102 ... I / O 103 ... RAM 104 ... DAC 105 ... Counter 106 ... Interrupt controller 107 ... Triangle wave oscillator 108 ... Comparator 110 ... CPU 201 ... ACM drive circuit 202 ... DCM drive circuit

Claims (3)

[Claims] 1. A cylinder system including a printing cylinder, a drive system for driving the cylinder system, and a DC motor for supplying printing paper to the cylinder system, which is mechanically separated from the cylinder drive system. A paper feed control device for a printing machine having a paper feed system, comprising: cylinder synchronization pulse generation means for generating a pulse synchronized with the cylinder rotation; cylinder reference position detection means for detecting a rotation reference position of the cylinder; The sheet feeding operation-corresponding pulse generating means for generating a pulse corresponding to the sheet conveying operation by the sheet feeding system, the sheet feeding system reference position detecting means for detecting the reference position of the sheet feeding system, and the cylinder rotation reference position Cylinder rotation amount detection means for obtaining the cylinder rotation amount as a starting point by counting pulses synchronized with the cylinder rotation, and the paper feed reference position as a starting point. The sheet feeding amount detecting means for obtaining the sheet feeding amount by counting the pulses corresponding to the sheet feeding operation and the cylinder rotation amount and the sheet feeding amount are compared and arithmetically processed. In a paper feed control device for a printing press, which comprises a comparison calculation means for driving a motor, the comparison calculation means synchronizes the paper feed amount based on the cylinder rotation from the paper feed amount and the cylinder rotation amount. Subtraction means for obtaining a movement amount difference which is an error; speed detection means including at least means for detecting a paper transport speed based on the fed paper feed amount or means for detecting a cylinder rotation speed based on the cylinder rotation amount; and the paper transport speed. Or a multiplying means for multiplying the cylinder rotation speed by a fixed number, and a DC motor applied voltage based on the multiplication result, the reference output and the movement amount difference. Feed control device of the configuration the printer to control. 2. The comparison operation means, the subtraction means, an integration means for integrating the movement amount difference, an integration start timing detection means for detecting a start timing of the integration operation, and a predetermined number in the integration result. The sheet feeding control device for a printing press according to claim 1, further comprising a multiplying unit for multiplying, wherein the DC motor applied voltage is controlled based on the multiplication result, the reference output, and the movement amount difference. . 3. The comparison calculation means uses a pulse synchronized with the cylinder as a sampling pulse of a control system, detects the cylinder rotation amount and the sheet conveyance amount each time the sampling pulse is generated, and performs a comparison calculation, The sheet feeding control device for a printing press according to claim 1, wherein the sheet feeding control device is configured to control a DC motor applied voltage.