JP2002249268A - Control method and control device for operation start of rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the looseness of a web at low cost without wrinkling the web in the operation start of a rotary press to shorten the time required for stabilizing the traveling thereof. SOLUTION: In the operation start of the rotary press, the circumferential speed of a downstream drug is set to a prescribed moderate operation speed, and the circumferential speed of an upstream drug is set lower than that of the downstream drug in the state where the paper pressers of both the drugs are released, and each drug is moderately operated. During the moderate operation, the web tension between the upstream drug and the downstream drug is monitored. When a prescribed web tension state is detected, the upstream drug is returned to the above moderate operation speed. When both the drugs are returned to the moderate operation speeds, both the drugs are raised in speed to the lowest speed range of the general operation speed of a machine, and the paper presser of each drug is attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method and control apparatus for starting a rotary printing press, which is suitable for restarting a rotary printing press from a machine stop state.

[0002]

2. Description of the Related Art FIG. 2 is a schematic structural view for explaining main parts of a general commercial rotary offset printing press. As shown in FIG. 2, a general commercial offset rotary printing press includes a paper feeding unit 1, an infeed unit 2, a printing unit (also simply referred to as a printing unit) 3, a drying unit 4, a cooling unit 5, and a web. A pass unit 6, a folding unit 7, a control unit 8 for appropriately controlling them, and the like are provided as main components.

The paper feed unit 1 includes a reel stand (not shown) on which roll-shaped webs 11 and 12 are mounted, and connects the new and old webs to each other during the printing operation to continuously form the web 10. Works to feed. Here, web 1
Reference numeral 2 denotes a sheet in use, and the web 11 is prepared for the next use. A paper feed brake that regulates paper feed is provided on the shaft of each of the webs 11 and 12.

[0004] The infeed section 2 includes a web 11,
A portion that continuously pulls out the web 10 from the web 12 and serves as a means for appropriately controlling the web tension (web tension) to the infeed drag (infeed roller) 21 for sandwiching and rotating and transporting the web 10 to the downstream side. And a dancer roller 22 (see FIG. 3 and provided between the in-feed drag 21 and the in-feed tension pick 92 shown in FIG. 2). Reference numeral 23 denotes a tension fluctuation absorbing damper.

[0005] The infeed drag 21 is connected via a continuously variable transmission 82 to a main drive shaft 81 for interlocking the entire printing press, and the rotational driving force from the main drive shaft 81 is transmitted. . The operations of the main drive shaft 81 and the continuously variable transmission 82 are controlled by the control unit 8. Dancer roller 22
As shown in FIG. 3, is rotatably mounted via a arm 22b to a rotating shaft 22a arranged in parallel with the web 10 in a direction perpendicular to the running direction of the web 10,
The arm 22b is elastically supported by the air cylinder 22c in the up and down direction (that is, the direction in which the arm 22b comes into contact with the running surface of the web 10).

The dancer roller 22 is provided between the guide rolls 24a and 24b, and the web 10 is formed by the guide roll 24a, the dancer roller 22, and the guide roll 24.
When the web 10 is running in a winding state, if the tension of the web 10 is weak, the dancer roller 22 is lowered by the air cylinder 22c to increase the tension of the web 10, and if the web 10 is strong, the dancer roller 22 is opposed to the air cylinder 22c.
Rises to reduce the tension of the web 10.

In the printing section 3, a plurality of sets of printing apparatuses 31a to 31d having different ink colors are usually arranged side by side in the web running direction. In the printing section 3, the web 10 is printed by the printing apparatuses 31a to 31d. The multi-color printing can be performed by sequentially passing the sheets through the printer. Then, the web 10 that has been printed in the printing unit 3 is heated and dried in the drying unit 4 in the next step, and then cooled in the cooling unit 5 and transferred to the web pass unit 6 where it is cut and folded in the folding unit 7. Can be The cooling part 5 is provided with a cooling drag 51, and the web path part 6 is provided with a web path drag 61.

[0008] Similarly to the infeed drag 21, the cooling drag 51 is connected via a continuously variable transmission 83 to a main drive shaft 81 for interlocking the entire printing press. Is transmitted. The web pass drag 61 is also connected via a continuously variable transmission 84 to a main drive shaft 81 for linking the entire printing press, so that the rotational drive force from the main drive shaft 81 is transmitted. The operation of the continuously variable transmissions 83 and 84 is also controlled by the control unit 8.

The in-feed drag 21, the cooling drag 51, and the web pass drag 61 are also described.
Can be switched between a state in which the paper holder is put on and a state in which the paper holder is removed. The web 10 in the folding unit 7 is longitudinally folded in two via a triangular plate (forming) 71, and then sequentially passes through a lead-in roller 72 and a folding machine drag (nipping roller) 73 to form a saw cylinder 74.
The sheet is cut at a predetermined position by the folding cylinder 75 and folded to form a desired signature, and thereafter is carried out.

Next, a control device and a control method relating to the web at the start of operation of the conventional rotary printing press will be described.
In the rotary printing press, when printing of the current order is completed, the machine is stopped and washed, and the printing wound on the plate cylinder is replaced, and other preparations for the next order are performed. In this case, the web path line on which the web 10 travels becomes free to release the engagement (nipping) of the blanket cylinder, the nip roller 73 of the folding unit 7, and the like.

Accordingly, the tension acting on the web 10 that has passed the paper is lost, and the web 10 is in a state of being relaxed in the middle. When printing is restarted from such a state, a problem occurs such that the printing position shifts in the vertical direction or the processing position shifts for a long time when the web 10 is cut or folded in the folding unit 7 for a long time. .

Therefore, in the conventional apparatus, the following operation is performed at the time of starting printing (start of reprinting due to an order change or the like). First, the paper feed brake 12 is turned on to regulate paper feed. And infeed drag 2
First, the paper holding of the cooling drag 51 and the web pass drag 61 is released, and the slugging operation for running the web 10 at an extremely low speed is started. At this time, each drag 21, 5
The speeds 1 and 61 are set equal to those at the time of normal printing.

After starting the slack operation, the slack operation is continued until the state of the web 10 in the printing press is stabilized (the slack is eliminated and the meandering is corrected). Then, when the state of the web 10 in the printing press is stabilized, the web running speed is increased to the minimum operation speed of the apparatus (40 to 80 rpm). When the speed is increased to the minimum operation speed, the infeed drag 21, the cooling drag 51, and the web pass drag 61
Put on the paper holder.

[0014]

However, in the above-described control device and control method at the time of starting operation of the rotary printing press, the conventional web printing press until the web is slackened, the meandering is corrected, and the web runs stably. Takes a lot of time, and all the webs 11 running (consumed) during that time become waste. At the same time, the waiting time until the web 11 runs stably is wasted.

Further, until the web is stretched, the behavior of the web in the printing press becomes unstable due to meandering or the like, and causes a trouble such as a paper jam. That is, in the conventional apparatus, there is a problem that not only the productivity is reduced but also the loss of the material (rolled paper) is increased, which leads to an increase in production cost. Incidentally, Japanese Patent Application Laid-Open No. 6-122188 discloses a technique for controlling the tension of the in-feed drag and the cooling drag below the minimum speed of the machine. However, in the case of such tension control, since it is usually necessary to put the paper press of each drag in a worn state, it may cause wrinkles on the web depending on the state of the web at the time of stopping. In addition, it is necessary to newly provide a controller for tension control, which leads to an increase in cost.

Japanese Patent Application Laid-Open No. 11-139,641 discloses a technique in which, at the start of operation, the web is stretched by driving the drag by torque control in the order of in-feed drag, cooling drag, web pass drag, and folder drag. Is disclosed. However, this technique also requires that the paper press of each drag be normally put on during torque control, and this may cause wrinkles on the web depending on the state of the web when stopped. .

The present invention has been made in view of the above problems, and has been made to prevent wrinkles from being generated on a web.
It is an object of the present invention to provide a control method and a control device at the start of operation of a rotary printing press, which can reduce the time required for running the web to be stable by reducing the slack of the web at low cost.

[0018]

In order to achieve the above-mentioned object, a control method at the time of starting operation of a rotary printing press according to the present invention (claim 1) is provided with a plurality of device parts. In a rotary printing press having an upstream drag and a downstream drag for driving the web on the upstream side and the downstream side of the apparatus section, a method for controlling the movement of the web at the start of operation, With both the upstream drag and the downstream drag with the paper press removed,
A first step in which the peripheral speed of the downstream drag is set to a predetermined slow operation speed, the peripheral speed of the upstream drag is made slower than the peripheral speed of the downstream drag, and each of these drags is slowly operated. Monitoring the web tension between the upstream drag and the downstream drag during the slack operation of the first step, and if a predetermined web tension state is detected, the upstream drag is swung. A second step of returning to the operating speed, and when both drags return to the slow operation speed by the second step, the two drags are raised to a minimum speed range of the normal operating speed of the machine. And a third step of putting on the paper press of each drag.

The control method at the time of starting the operation of the rotary printing press according to the present invention (claim 2) is based on a feeder unit having an infeed drag, a printing unit, a drying unit, and a cooling unit having a cooling drag. And a web path unit having a web path drag, and a folding unit, in a rotary printing press provided sequentially from the upstream side of the running line of the web, a method of controlling the movement of the web at the start of operation, comprising: In doing so
First, with the infeed drag, the cooling drag, and the web pass drag all removed from the paper press, the peripheral speed of the web pass drag is set to a predetermined slow operation speed, and the peripheral speed of the cooling drag is set. A lower speed than the peripheral speed of the web path drag and a lower peripheral speed of the infeed drag than the peripheral speed of the cooling drag, and a first step of slowly operating each of these drags; During the one-step slack operation, the web tension between the infeed drag and the cooling drag and the web tension between the cooling drag and the web pass drag are monitored to determine a predetermined web in each section. A second step of returning the drag on the upstream side of the section to the above-mentioned slow operation speed when the tension state is detected; and When all the drags have returned to the slow operation speed, all the drags are raised to the lowest speed range of the normal operation speed of the machine, and the paper retainer of each drag is worn. It is characterized by having steps.

The ratio of the peripheral speed of the cooling drag to the peripheral speed of the web path drag and / or the ratio of the peripheral speed of the infeed drag to the peripheral speed of the cooling drag is a predetermined speed ratio set in advance. (Claim 3). Further, the control device at the time of starting the operation of the rotary printing press according to the present invention (claim 4) includes a paper feed unit having an infeed drag, a printing device unit, a drying unit, a cooling unit having a cooling drag, a web, An apparatus for controlling the movement of a web at the start of operation in a rotary printing press provided with a web path section having a path drag and a folding section in order from the upstream side of a web running line, the apparatus comprising: A paper press attaching / detaching means provided for the cooling drag and the web pass drag, a drag driving means for rotating the in-feed drag, the cooling drag and the web pass drag at respective individual speeds, Means and control means for controlling the drag drive means, wherein the control means
First, with the infeed drag, the cooling drag, and the web pass drag all removed from the paper press, the peripheral speed of the web pass drag is set to a predetermined slow operation speed, and the peripheral speed of the cooling drag is set. Is set lower than the peripheral speed of the web path drag and the peripheral speed of the infeed drag is set lower than the peripheral speed of the cooling drag to cause each of these drags to perform a slow operation. The web tension between the infeed drag and the cooling drag and the web tension between the cooling drag and the web pass drag are monitored, and when a predetermined web tension state is detected in each section, the upstream of the section is monitored. When the drag on the side is returned to the above-mentioned slow operation speed and all the above-mentioned drags return to the above-mentioned slow operation speed, all the above-mentioned drags are returned. Together to speed-up to the lowest speed range of the normal operating speed of the machine is characterized in that the wearing paper pressing.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a control method at the start of operation of a rotary printing press according to an embodiment of the present invention. The control device and the rotary printing press according to the present embodiment will be described with reference to FIGS. First, a rotary printing press according to the present embodiment will be described with reference to FIGS.
This will be described with reference to FIG.

The rotary printing press according to the present embodiment includes:
As shown in FIG. 2, a paper feed unit 1, an infeed unit 2, a printing unit (printing unit) 3, a drying unit 4, a cooling unit 5, A web path unit 6, a folding unit 7, a control unit 8 for appropriately controlling them, and the like are provided as main components. Since these parts have already been described, here, the parts related to control at the start of operation will be mainly described.

The apparatus components related to the transport control of the web (printing paper) 10 at the start of operation include an element for driving (or braking) the web 10 and an element for detecting a tension state (web tension) of the web 10. And a control system element (control means) for controlling the web driving element from the information of the detection element. Elements for driving or braking the web 10 include:
A paper feed brake (not shown) provided on the shafts of the roll-shaped webs 11 and 12 of the paper feed unit 1 and an infeed drag (infeed roller) 21 provided in the infeed unit 2
A cooling drag 51 provided in the cooling unit 5; a web pass drag 61 provided in the web pass unit 6; and a folding drag (nipping roller) provided in the folding unit 7.
73.

These drags (drag rollers) 21 and 5
1, 61, 71 are driven by a main drive shaft (drag drive means) 81 through continuously variable transmissions 82, 83, 84,
Further, the paper presser can be switched between a worn state and a detached state by a paper presser attaching / detaching means (not shown). Elements for detecting the tension state (web tension) of the web 10 include a feed tension pick 91 provided immediately upstream of the infeed drag 21 and an infeed tension pick 92 provided immediately downstream of the infeed drag 21. And a cooling tension pick 93 provided immediately upstream of the cooling drag 51, and a cooling / web path tension pick 94 provided immediately upstream of the web path drag 61.

A control unit 8 is a control system element (control means). At the start of operation, the control unit 8 controls the web 10 between the infeed drag 21 and the cooling drag 51 detected by the infeed tension pick 92.
And the web 1 between the cooling drag 51 and the web pass drag 61 detected by the cooling / web pass tension pick 94.
On the basis of the zero tension state (web tension), the respective rotation states of the infeed drag 21, the cooling drag 51, and the web pass drag 61 are controlled to proceed to normal operation. In this case, the continuously variable transmission 82,
The rotational speeds of the drags 21, 51, 61 are controlled through 83, 84.

More specifically, in the control method (control method at the time of starting the operation of the rotary printing press) performed through the control unit 8, FIG.
As shown in the figure, upon starting the operation, first, the infeed drag 2 is started in accordance with the operation start operation (step S10).
1, the cooling drag 51, and the web pass drag 61 are all in a state where the paper press is removed, and the operating speed (peripheral speed) of the in-feed drag 21 and the cooling drag 51 is set to be lower than before (step S2).
0), the drags 21, 51, and 61 are slowly operated (step S30).

That is, the peripheral speed V of the web path drag 61
3 is set to a predetermined slow operation speed, the peripheral speed V2 of the cooling drag 51 is made slower than the peripheral speed V3 of the web pass drag 61, and the peripheral speed V1 of the infeed drag 21 is further reduced.
To be lower than the peripheral speed V2 of the cooling drag 51,
These drags 21, 51, 61 are operated slowly.
That is, each of the peripheral velocities V1, V2, V3 is V1 <V2 <
V3. In this case, the peripheral speed ratio V1 /
V3, V2 / V3 may be set to a predetermined speed ratio of, for example, about several percent to ten percent.

During this slow operation, the web tension between the infeed drag 21 and the cooling drag 51 is monitored by the infeed tension pick 92, and the cooling drag 51 and the web pass drag are monitored by the cooling / web path tension pick 94. Monitor web tension between 61. As described above, drag 21,
At 51 and 61, the driving speed applied to the web 10 from each of the drags 21, 51 and 61 is set to be lower as the peripheral speed of the drag on the upstream side even if the paper holding of each of the drags 21, 51 and 61 is released. The web tension between the infeed drag 21 and the cooling drag 51 and the cooling drag 51 and the web pass drag 6
1 quickly occurs.

Then, when the slack of the web 10 is eliminated in any section (that is, the web 10 is stretched or a predetermined web tension state is detected),
The drag on the upstream side of the section is returned to the slow operation speed. When the outputs of the tension picks 92 and 94 become 0 or more, it can be determined that the slack of the web 10 has been eliminated.

For example, the infeed tension pick 9
2, the infeed drag 21 and the cooling drag 5
1 is detected, the peripheral speed V1 of the infeed drag 21 is returned to the slow operation speed V3 (Step S40), and the cooling drag 51 and the web pass drag 61 are moved by the cooling / web pass tension pick 94. When the web tension is detected, the peripheral speed V2 of the cooling drag 51 is returned to the slow operation speed V3 (step S50).

In this way, all the drags 21, 5
When all the peripheral speeds of the drags 21 and 5 return to the slow operation speed V3 (step S60), all the drags 21 and 5
1, 61 is the lowest speed range of the normal operation speed of the machine (for example, 4
0 to 80 rpm) (step S
70), the paper holder is put on (step S80). It is preferable that the holding of the paper (step S80) be performed during the temperature increase after the start of the speed increase.

The control method and the control device at the start of the operation of the rotary printing press according to an embodiment of the present invention are configured as described above. In the drags 21, 51, and 61, the peripheral speed of the upstream drag is increased. Since the speed is set to low speed, even if the paper holding of each of the drags 21, 51, 61 is released, each drag 2
Due to the difference in driving force applied to the web 10 from 1, 51, 61, the web 10 tends to stretch, and the web tension between the infeed drag 21 and the cooling drag 51, and the cooling drag 51 and the web pass drag. The web tension between the web 10 and the web 61 is quickly generated, the slack of the web 10 is eliminated, and the web 10 can quickly proceed to the speed-up stage (steps S70 and S80).

As described above, since the time required for the web 10 to be loosened and the meandering to be corrected and the web to run stably can be shortened, the waste paper of the web 10 can be reduced and the web 10 can run stably. It is also possible to reduce the waiting time before performing. Further, since the time until the web 10 is stretched is short, the behavior of the web in the printing press does not become unstable due to meandering or the like, and it is possible to prevent a cause of a trouble such as a paper jam.

Therefore, the productivity is improved, the loss of materials (rolled paper) is reduced, and reduction of various production costs can be promoted. Further, since the web 10 is slackened by giving a speed difference between the drags 21, 51, 61 while removing the paper presses of the drags 21, 51, 61, even if the web 10 has meandering, the web 10 can be removed. No wrinkling occurs, and even when the position of the stopped web 10 is uneven, the web 10 is quickly centered.

Further, since the web 10 is slackened by giving a speed difference between the drags 21, 51, 61 while removing the paper presses of the drags 21, 51, 61, the drags 21, 51, 61 are removed. Sliding between the web 10 and the web 10 can occur, and if excessive tension is applied to the web 10, the excessive tension can be avoided by the slip, so that the web 10 does not break.

Moreover, in practice, there is an error in the detection of the tension pick, and the tension is detected through a certain low-pass filter. hard. Further, according to this method, the mechanism related to the peripheral speed ratio control (draw control) provided in the conventional printing press can be used as it is, and a new hardware configuration such as a control device and sensors is not required, and the cost is low. Can be configured.

Although the embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and can be variously modified and implemented without departing from the gist of the present invention. For example, in the above embodiment, the control at the start of the operation is performed through the control unit (control means) 8, but a part of the control may be performed by an artificial operation.

As for the tension pick, a paper feed tension pick 91, a cooling tension pick 93 or the like may be used as necessary, and the web tension may be detected by other means. Further, in the present invention, at the time of the slow operation, the peripheral speed of the downstream drag is set to a predetermined slow operation speed in a state in which both the upstream drag and the downstream drag are detached from the paper press, and the upstream drag is controlled. The purpose is to make the web slack quickly by setting the circumferential speed lower than the circumferential speed of the downstream drag (that is, a predetermined slow operation speed), and can be implemented in various modes.

[0039]

As described above in detail, the control method at the time of starting the operation of the rotary printing press according to the present invention according to the first to third aspects and the control at the time of starting the operation of the rotary printing press according to the present invention according to the fourth aspect. According to the device, the time required for the web to run stably can be reduced, so that the waste paper of the web is reduced,
The waiting time until the web runs stably can also be reduced, the productivity can be improved, the loss of materials (wrapping paper) can be reduced, and various costs can be reduced.

Further, even if the web is meandering, the web is not wrinkled, the web is quickly centered, and the web can be prevented from being excessively tensioned. In addition to this, the mechanism for peripheral speed ratio control (draw control) provided in the conventional printing press can be used as it is,
There is also an effect that a new hardware configuration such as a control device or a sensor is not required and the configuration can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a control method at the start of operation of a rotary printing press according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing a device configuration of a general rotary printing press according to a control device at the start of operation of the rotary printing press as one embodiment of the present invention.

FIG. 3 is a schematic side view showing a main part configuration of a general rotary printing press according to a control device at the start of operation of the rotary printing press as one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper feed unit 2 infeed unit 3 printing device unit (printing unit) 4 drying unit 5 cooling unit 6 web path unit 7 folder unit 8 control unit (control means) 10 web 11, 12 roll-up paper 21 infeed drag ( Infeed roller 22 Dancer roller 23 Damper for absorbing tension fluctuation 31a to 31d Printing device 51 Cooling drag 61 Web pass drag 71 Triangular plate (forming) 72 Lead-in roller 73 Folding machine drag (nipping roller) 74 Saw cylinder 75 Folding cylinder 81 Main drive Shafts (drag drive means) 82 to 84 continuously variable transmission 91 paper feed tension pick 92 infeed tension pick 93 cooling tension pick 94 cooling / web path tension pick

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2C034 AD03 AD09 AD11 AD12 AD21 AD23 2C250 EA06 EA32 EA33 EB03 3F105 AA01 AB03 BA01 BA07 CB01 DA04 DA09 DA13 DC03

Claims (4)

[Claims] 1. A rotary printing press having a plurality of device sections and having an upstream drag and a downstream drag for driving a web on an upstream side and a downstream side of any one of the apparatus sections. A method of controlling the movement of the web at the time of start, wherein, at the start of operation, first, the peripheral speed of the downstream drag is reduced in a state in which both the upstream drag and the downstream drag have their paper presses removed. A first step in which a predetermined slow operation speed is set, the peripheral speed of the upstream drag is made slower than the peripheral speed of the downstream drag, and each of these drags performs a slow operation; During the slugging operation, the web tension between the upstream drag and the downstream drag is monitored, and when a predetermined web tension state is detected, the upstream drag is returned to the slow operation speed. A step, the second When the two drags return to the slow operation speed by the steps of the above, the two drags are raised to the lowest speed range of the normal operation speed of the machine, and the third paper holding the paper press of each drag is performed. A control method at the start of operation of a rotary printing press, comprising the steps of: 2. A paper feed unit having an infeed drag,
In a rotary printing press provided with a printing device unit, a drying unit, a cooling unit having a cooling drag, a web pass unit having a web pass drag, and a folding unit in order from the upstream side of the web traveling line, A method of controlling the movement of the web at the time of start, wherein at the start of operation, first, the infeed drag, the cooling drag, and the web pass drag are all removed from the paper press, and the web pass drag is removed. The peripheral speed is a predetermined slow operation speed, the peripheral speed of the cooling drag is lower than the peripheral speed of the web pass drag, and the peripheral speed of the infeed drag is lower than the peripheral speed of the cooling drag, A first step of slowly operating each of these drags, and during the slow operation of the first step, the infeed drag and the cooling drag; And the web tension between the cooling drag and the web pass drag is monitored, and when a predetermined web tension state is detected in each section, the drag on the upstream side of the section is moved to the above-mentioned slow operation speed. When all the drags have returned to the slow operation speed by the second step, all the drags are raised to the minimum speed range of the normal operation speed of the machine. With
A method for controlling the start of operation of a rotary printing press, comprising the third step of putting on the paper press of each drag. 3. The ratio of the peripheral speed of the cooling drag to the peripheral speed of the web pass drag and / or the ratio of the peripheral speed of the infeed drag to the peripheral speed of the cooling drag may be a predetermined predetermined value. 3. The method according to claim 2, wherein the speed ratio is a speed ratio. 4. A paper feed unit having an infeed drag,
A printing press unit, a drying unit, a cooling unit having a cooling drag, a web pass unit having a web pass drag, and a folding unit are started to operate in a rotary printing press provided sequentially from an upstream side of a web running line. An apparatus for controlling the movement of the web at times, the paper feed attaching / detaching means provided for the infeed drag, the cooling drag, and the web pass drag, respectively, the infeed drag, the cooling drag, and the web pass drag. And a control means for controlling the attachment / detachment means and the drag drive means, the control means comprising: With both the cooling drag and the web pass drag with the paper press removed, the peripheral speed of the web pass drag At a predetermined slow operation speed, the peripheral speed of the cooling drag is set lower than the peripheral speed of the web pass drag, and the peripheral speed of the infeed drag is set lower than the peripheral speed of the cooling drag. The drag is slowly operated. During the slow operation, the web tension between the infeed drag and the cooling drag and the web tension between the cooling drag and the web pass drag are monitored, and each section is monitored. When a predetermined web tension state is detected, the drag on the upstream side of the section is returned to the slow operation speed, and when all the drags return to the slow operation speed,
A control device for starting operation of a rotary printing press, characterized in that all of the above drags are raised to a minimum speed range of a normal operation speed of the machine, and a paper presser is put on.