JPH0544531U - Paper threading device for web-fed rotary printing press - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a paper threading device that does not require the clutch operation of the operator even in the paper threading work up to the middle of the paper path. [Structure] The pulling member 10 is each driving roller 12A of the printing machine.
The limit switches 11A to 11G for detecting the arrival at the vicinity of
The drive rollers 12A-1 are driven by signals from A-11G.
A number of magnet clutches 13A to 13G corresponding to the drive rollers 12A to 12G for sequentially activating 2G are provided in the power transmission system.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a web threading device for a web-fed rotary printing press.

[0002]

[Prior Art]

 In general, newspaper rotary presses and the like are equipped with an automatic paper threading device in order to speed up and omit the paper threading work performed at the time of switching jobs or cutting paper while driving.

Conventionally, this automatic paper threading device is provided with a paper threading belt from a paper feed section to a folding section along a paper path to fix a standard position of a starting point and an end point of the paper threading. When paper is threaded to a point other than the end point, that is, a point in the middle of the paper path, it is necessary to mechanically feed the web being threaded, so the drive roller on the upstream side of the paper path from the desired end point. Is rotated in conjunction with the paper threading operation, but the drive roller on the downstream side of the desired paper path from the desired end point was stopped during the paper threading operation because the web on the downstream side must be retained.

[0004]

[Problems to be solved by the device]

 Therefore, it is necessary for the operator to previously disconnect the magnet clutch controlling the drive roller on the downstream side from the desired end point by a manual button operation, which imposes a heavy burden on the operator.

Therefore, an object of the present invention is to provide a paper threading device that does not require an operator's clutch operation even in the paper threading work up to the middle of the paper path.

[0006]

[Means for Solving the Problems]

 To achieve the above-mentioned object, the structure of the present invention comprises a detecting means for detecting the position of a pulling member for pulling a web moving along a paper path, and a plurality of means for sequentially activating a drive roller in response to a signal from the detecting means. And a power transmission means of.

[0007]

[Action]

 According to the above configuration, each drive roller of the printing machine is automatically driven in accordance with the movement of the pulling member, and the web being threaded is favorably fed.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the offset rotary press includes a paper feeding unit 1, an feeding unit 2, a printing unit 3, a drying unit 4, a cooling unit 5, a web path unit 6, and a folding unit 7 in the printing order. In addition, the belt 8 is laid endlessly along the paper path from the paper feeding unit 1 to the folding unit 7.

The belt 8 is driven by a motor 9 separately from the machine, and a pulling member 10 for pulling a web is fixed to one portion of the belt 8.

A plurality of limit switches 11A to 11G are provided along the laying route of the belt 8 to detect the arrival of the pulling member 10 near the drive rollers of the machine.

In the illustrated example, the drive roller 12 A of the infeed unit 2, the four drive roller pairs 12 B, 12 C, 12 D and 12 E of the printing unit 3, the drive roller group 12 F of the cooling unit 5 and the drive of the folding unit 7 It is arranged in front of each of the rollers 12G.

Magnetic clutches 13A to 13G are provided in the power transmission systems of the drive rollers 12A to 12G, respectively, and are activated (connected) when the corresponding limit switches 11A to 11G are turned on. It has become.

Next, the operation will be described. After the operator attaches the front end of the web to the pulling member 10, when the paper threading start button on the operation panel (not shown) is pressed, the motor 9 is activated and the rotation of the belt 8 causes the pulling member 10 to start moving.

The printing press also starts in conjunction with this, but at this time, all of the magnetic clutches 13A to 13G are in a disengaged state, and the drive rollers 12A to 12G are stopped.

After that, when the pulling member 10 comes into contact with the limit switch 11A disposed near the first drive roller 12A, the limit switch 11A issues a connection signal to the magnet clutch 13A, and the magnet clutch 13A becomes in the connected state. The drive roller 12A is activated.

Next, when the traction member 10 comes into contact with the limit switch 11B arranged near the second drive roller pair 12B, the limit switch 11B issues a connection signal to the magnet clutch 13B, and the magnet clutch 13B The connected state is established and the drive roller pair 12B is activated.

By sequentially executing the above-described operations, the leading edge of the web being threaded is pulled by the pulling member 10 and is fed to the drive rollers 12A to 12G in the middle of the paper path. Since the drive roller on the downstream side of the current position of the drafting member 10 is stopped without advancing excessive tension, which is a cause, the web on the downstream side of the desired end point can be fed. Instead, keep the condition before threading and stop.

After that, when the traction member 10 reaches the desired end point, the operator presses the stop button on the operation panel to separate the traction member 10 and the upstream web, and then the upstream web and the downstream web. The paper threading work is completed by pasting them together.

In the above embodiment, the movement of the belt 8 is performed without providing the limit switches 11A to 11G as means for detecting the position of the pulling member 10 and generating a connection signal to each of the magnet clutches 13A to 13G. The distance is detected (for example, the number of rotations of the motor 9 is detected by an encoder and converted into a distance, or the time from the start of the motor 9 is measured by a timer and converted into a distance), and a predetermined moving distance is obtained. A control means for issuing a connection signal may be provided to each of the magnet clutches 13A to 13G when the number of times reaches. Further, although the belt 8 is used as the rotating body, the present invention is not limited to this, and the same effect can be obtained by using a chain or the like. Further, other power transmission means may be used instead of the magnet clutches 13A to 13G.

Further, in the present invention, it is not necessary to detect that the pulling member 10 has reached the vicinity of each of the drive rollers 12A to 12G, and may be separated from each of the drive rollers 12A to 12G. Furthermore, one limit switch or magnet clutch need not be provided for each drive roller.

In addition, the present invention is not limited to the endless type paper threading device using the rotating body as in the above-described embodiment, and is disclosed in Japanese Patent Laid-Open No. 3-106746 and Japanese Utility Model Laid-Open No. 1-103647. It can also be applied to an open loop type paper threading device. By the way, in Japanese Patent Laid-Open No. 3-106746, a paper threader pooled in a paper threading body pool section is driven by a drive unit that operates in reverse from the downstream side of the paper threading path to the upstream side of the web material paper waiting position. Reverse running according to the threading guide, lock the web material on the paper locking member (corresponding to the pulling member 10 of the above-described embodiment) of this paper threading member, and then operate the drive unit in the forward direction to move the paper threading unit. There is one in which a web material is threaded along a paper threading body guide by moving the body from the upstream side to the downstream side of the paper threading route. A guide rail is laid along the through path, and a drive body is provided in a notch formed in the guide rail at a predetermined distance from each other. The drive body is driven by the drive body and can travel back and forth in the guide rail. The tip of the web is connected to the body. Those in which a clip (corresponding to the traction member 10 of the embodiment) for holding the paper connecting adapters removably is disclosed, respectively.

[0023]

[Effect of the device]

 As described above, according to the present invention, it is possible to realize the paper threading device that does not require the clutch operation of the operator even in the paper threading work up to the middle of the paper path, and reduce the burden on the operator.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an offset rotary press showing an embodiment of the present invention.

[Explanation of symbols]

 8 Belt 9 Motor 10 Traction member 11A to 11G Limit switch 12A to 12G Drive roller 13A to 13G Magnet clutch

Claims (1)

[Scope of utility model registration request] 1. A detection means for detecting the position of a pulling member for pulling a web that moves along a paper path, and a plurality of power transmission means for sequentially activating a drive roller in response to a signal from the detection means. A paper threading device for a web-fed rotary printing press.