JP2576126Y2 - Web through device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web passing device in a web processing machine such as a rotary printing press or a paper machine.

[0002]

2. Description of the Related Art Generally, in a web processing machine such as a rotary printing press or a paper making machine, which performs printing, bending, cutting, or the like on a web from a reel on which the web is wound in a roll shape. When the web is switched or when the web breaks during operation, a web is passed through the web to guide the web into the machine.

[0003] Hereinafter, a description will be given of an example in which a web passing device of a web processing machine is applied to a paper passing device of an offset rotary press. The paper threading as the web threading is performed by an automatic paper threading device in order to speed up the operation and save labor. That is, the leading end of the web as a web of the web as a reel rotatably supported by a paper supply unit as a web supply unit is attached to a chain or the like disposed along a paper passing path as a web passing path. , And by driving this chain or the like, the paper roll is pulled out and passed through the machine.

[0004]

By the way, in a paper threading device of a web-fed rotary printing press, it is extremely difficult to completely avoid paper breakage during the paper threading operation, especially for thin paper.

[0005] This is because it is practically impossible to completely eliminate factors that hinder the paper threading operation, such as ink deposited on the blanket of the printing unit or water droplets condensing on the roller surface of the cooling unit. I do.

[0006] If the paper is once cut during the paper threading operation, the paper upstream of the paper cut section stays, and the paper downstream of the paper cut section continues to be pulled by a holder or the like of the paper threading device, and the operator notices. Until the paper threading operation is stopped.

After that, in order to continue the paper threading operation,
It is common practice to guide the paper edge upstream from the paper cut section to the downstream paper edge that has been preceded by the operator's manual operation, join them together, and continue the paper passing operation again. In some cases, the distance before the user notices and stops the paper threading operation is several tens of meters, and a considerable amount of labor is required to join the two manually.

In order to prevent such a situation from occurring, it is conceivable that the operator continuously monitors the paper break during the paper threading operation and immediately stops the paper threading operation when the paper breakage occurs. In this case, the operator cannot engage in other tasks during the threading operation, which is inefficient.

[0009]

According to the present invention, there is provided a web threading apparatus for a web processing machine according to the present invention, which holds a web with a pulling member and pulls the web through the web path of the machine by pulling the web with the pulling member. The apparatus is characterized by comprising detecting means for detecting the state of the web, and stopping means for issuing a command to stop the towing operation of the web by the towing member based on a signal from the detecting means.

[0010]

In the paper threading device having the above-mentioned structure, if the web is broken, a command to stop the operation of the traction member is issued and the web threading is stopped based on the detection result of the detecting means for detecting the state of the web. Is done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a web threading device of a web processing machine according to the present invention will be described with reference to the drawings. FIG. 1 shows an outline of an embodiment in which the present invention is applied to a paper threading device of an offset rotary press, and FIG. 2 schematically shows an offset rotary press and a paper threading device thereof.

First, an outline of the configuration of an offset rotary press will be described with reference to FIG. 2. The offset rotary press includes a paper feed unit 1, an infeed unit 2, and a print unit 3 as a web supply unit installed according to a printing order. , A drying section 4, a cooling section 5, a web path section 6, and a folding section 7. A web 8 as a reel is rotatably supported by the paper feeding unit 1.

[0013] A paper threading device provided in this offset rotary press includes a chain 9 as a transport member disposed endlessly along a paper path as a web passing path, and a drive for driving the chain 9 separately from the machine. And a motor 10 as means. As shown in FIG. 1, a holder 11 is attached to the chain 9 as a traction member.

Referring to FIG. 1, the paper threading device according to the embodiment will be described. The paper feed unit 1 is provided with a rotary encoder 12 as means for detecting the state of the paper 8a as a web. That is, the rotation speed of the web 8 is detected.

The detection signal of the rotary encoder 12 is F
The voltage is converted into a voltage by the / V converter 13 and input to the control device 14. The control device 14 includes a determination unit serving as a determination unit that determines whether the voltage is equal to or less than a set value or zero, and instructs the motor driver 15 to stop the motor 10 when the voltage is determined to be equal to or less than the set value. And a stop unit as a stop means for outputting the pressure.

Next, the stopping operation of the paper threading operation in the case where a sheet break occurs during paper threading will be described with reference to FIG.

The paper threading is performed by holding the leading end of the paper 8a of the web 8 with the holder 11 and driving the chain 9 with the motor 10. By driving the chain 9, the paper 8a is pulled out and passed through the paper path of the printing press. A in FIG. 3 indicates a rising range of the rotation speed of the web 8 at this time.

When the paper threading operation is performed normally,
The rotation speed of the web 8 is substantially constant as shown by a range B in FIG. The rotation speed slightly fluctuates (λ in FIG. 3) due to the imbalance of the web 8 or the difference between the paper path and the chain path. The web 8 is a paper 8a.
Is rotated only by the pulling force.

When a sheet break occurs at a certain time t (X in FIG. 3), the traction force for rotating the web 8 is interrupted, so that the web 8 continues to rotate due to inertia (C in FIG. 3), but the speed gradually increases. Decreases, and stops (D in FIG. 3). When the rotation of the web 8 slows down, the voltage output from the F / V converter 13 to the control device 14 decreases. When the voltage falls below a set value or becomes zero, the determination unit of the control device 14 determines that a sheet break has occurred. It is done. In addition, this judgment does not immediately judge that the sheet is broken when the voltage below the set value is applied, but judges that the sheet is broken if the voltage continues to be below the set value or stays zero for a certain period of time by the timer. I do.

When the judgment section judges that the sheet is broken, the stop section issues a stop command to the motor driver 15 to stop the motor 10 in response to the judgment. Therefore, the chain 9 stops, and the pulling of the paper 8a, that is, the paper passing operation is stopped.

If the paper threading operation is interrupted as described above due to the sheet breaking, the operator performs paper joining or the like, and then resumes paper threading.

In the above embodiment, the rotary encoder 12
Is converted to a voltage using the F / V converter 13, but the counter output is used to count the number of pulses output from the rotary encoder 12 in place of the F / V converter 13. A motor stop signal may be issued to the motor driver 15 when the number is equal to or less than the set number or zero for a certain time.

As the means for detecting the running state of the paper 8a, other than the means for detecting the rotational speed, for example, a rotational acceleration signal of the web 8a may be used to detect the occurrence of paper break as soon as possible. In order to avoid a malfunction, a rotation amount signal of the web 8 may be used. Furthermore, the circumferential length of the web 8 may be separately detected to obtain a traveling speed (= web circumferential length × rotational speed) signal of the paper 8a, and the determination may be made based on the signal.

The means for detecting the state of the paper 8a does not need to be provided on the rotating shaft of the web 8;
May be provided, and the rotation may be detected. Further, the method of detecting the state of the web is not limited to the method of detecting the speed of the web, and may be, for example, the method of detecting the tension of the web.

Although the embodiment shown in FIG. 1 shows an example in which one paper roll 8 is supported by the paper feed unit 1, it is needless to say that a plurality of paper rolls may be supported in a switchable manner. For example, when three rolls of paper are supported and one roll of paper at the paper feed position runs out, the next roll of paper comes to the paper feed position and is ready to be fed.

FIG. 2 shows a paper passing device to which the present invention is applied, which passes paper from the paper feeding unit 1 to the folding unit 7.
The present invention can be similarly applied to a device that pulls paper halfway, such as from the paper feeding unit 1 to the drying unit 4 as shown in FIG.
Further, the present invention can be similarly applied to a device that pulls paper from the middle, such as from the cooling unit 5 to the folding unit 7. In the drawing, reference numerals 16 and 17 denote chains of the paper passing device, and reference numerals 18 and 19 denote motors.

In the above-described embodiment, the present invention is applied to a paper threading device of an offset rotary press. However, the present invention is not limited to the offset rotary press but is applied to a web threading device of other machines in general. it can. Further, although paper is used as the web, it is not limited to paper, but may be a band such as cloth or plastic film.

[0028]

[Effect of the Invention] According to the web passing device according to the present invention,
If a web break occurs during web passing operation, it is automatically detected and the web passing operation is stopped immediately,
The operation for joining the upstream web and the downstream web can be simplified.

Further, it is not necessary for the operator to monitor the occurrence of the breakage of the web, so that labor can be saved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a paper threading device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an example of an offset rotary press and a paper threading device provided therein.

FIG. 3 is a diagram showing a change in web rotation speed;

FIG. 4 is a schematic diagram of another example of an offset rotary press and a paper threading device provided with the offset rotary press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed part 3 Printing part 4 Drying part 5 Cooling part 7 Folding part 8 Web paper 9 Chain 10 Motor 11 Holder 12 Rotary encoder 13 F / V converter 14 Control device 15 Motor driver

Continuation of the front page (56) References JP-A-4-312851 (JP, A) JP-A-4-214354 (JP, A) JP-A-5-74839 (JP, U) JP-A-3-23439 (JP) , U) Real opening 616-196031 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B41F 33/18 B41F 13/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A web passing device for holding a web with a traction member, drawing the web with the traction member and passing the web through a web path of a machine, detecting means for detecting a state of the web, and the traction member based on a signal from the detection means. And a stopping means for issuing a web pulling operation stop command by the web passing device.