JPH0160397B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is designed to cut the running web into pieces in each part of the printing machine to prevent printing when an abnormality such as paper breakage occurs in the running web during operation of a rotary press printing machine. This invention relates to a paper cutting device for preventing web paper from wrapping around a cylinder, ink roller, etc.

(Prior art) Conventionally, during printing operation of a rotary press, if a paper break occurs in the middle of a web running for several tens of meters, the paper enters the printing cylinder, ink roller, folding machine cylinder, etc. wrapped,
It damages the machine and requires a lot of effort to remove the wrapped paper. Therefore, each part of the printing machine is provided with a paper cutting device for cutting the running web into pieces. FIG. 4 is a perspective view of a conventional paper cutting device, in which 1 is a running web, 2 is a cutting blade,
Reference numeral 3 denotes a blade holder, which cuts the running web 1 by vertically reciprocating the serrated blade 2 attached to the upper side in the direction perpendicular to the flow of the running web 1. There are shapes such as shaped or rubber. The cutting mechanism is such that a serrated cutting edge makes a slit in the traveling web to which a tensile load of approximately 40 kg to 50 kg is applied, and the cutting is performed by the notch effect of the pedestal 3. However, if the paper is loose due to low tension or the like, it is difficult to cut the wound web simply by applying the blade. Furthermore, even if a signal is given to stop the machine at the same time as the paper (web) is cut during operation, it will take several seconds for the rotation to completely stop due to inertia, so the cut paper (web) will not work properly. There are cases where the web gets caught up in a part other than the web travel route. In addition, with conventional paper cutting equipment,
Depending on the paper quality, web running conditions, tension, etc., it may not be possible to cut the paper completely, and there is a risk of it being caught in each printing cylinder, ink roller, etc. due to incomplete cutting. This requires a great deal of effort and there is a risk of damage to various parts of the machine, including the printing copper.

(Object of the Invention) The present invention is intended to solve the above-mentioned problems, and at the same time as paper is cut, the shredded paper is wound up and collected, thereby preventing the paper from entering a part other than the normal web running path. The purpose is to prevent

(Structure of the Invention) The present invention provides a rotating body that is rotatable about an axis parallel to the printing cylinder axis in a web traveling path in a printing unit of a web printing machine, and rotates the web at least in the diametrical direction of the rotating body. A space that can be passed through is provided, and a paper cutting blade is attached to one end of both diametrical ends of the space, and a paper holding needle is attached to the other end of the space, with their tips facing the rotation direction in a direction parallel to the rotation axis. A clutch mechanism is provided on the rotating shaft of the rotary body to enable turning on and off of rotational power, and if necessary, a concentrically rotating outer cylindrical body is coated on the outer periphery of the rotary body, and the diameter of the outer cylindrical body is A window hole is provided at a relative position in the direction so that the web can be inserted therethrough, and positioning and fixing are provided on the outside of the outer cylindrical body to align the running direction of the web with the space portion of the rotary body and the passing direction of the window hole. This paper cutting device has a winding function and is characterized by being provided with a positioning stopper that can be fixed and released by the rotational force of a rotating body.

If the present invention is explained in detail according to the drawings, the first
The figure is a schematic side view illustrating an embodiment of the apparatus of the present invention, in which a cylindrical rotating body 4 is installed in front of a printing cylinder 6 in each printing unit of a rotary printing press.
The rotating body 4 is provided with a space 5 extending in its diameter direction, and the space 5 has a width in the vertical direction (slit width).
to the appropriate width, and also the axial width (longitudinal width)
can be set to be larger than the paper width in the direction perpendicular to the running direction of the printing paper (web), and the paper can be set at one end of both diametrical ends of the space 5 (downstream end with respect to the web running direction). A cutting blade 7, a paper holding needle 8 at the other end (the upstream end with respect to the web running direction)
are provided with their respective distal ends facing the rotational direction (forward rotational direction) during the cutting operation of the rotary body 4. and,
The web printing paper 1 introduced between the printing cylinders 6 is transferred to the rotating body 4
After being inserted into the space 5, the web printing paper 1 is run to perform printing.

FIG. 2 is a front view of an embodiment of the apparatus of the present invention, in which 1 is a running web printing paper, 7 is a cutting blade, 8 is a paper holding needle, and 9 is a rotating shaft 4a of a rotating body 4.
10 is a drive shaft that is driven and rotated simultaneously with the operation of the printing press body, 11 is an electromagnetic clutch, and 12 is a fixed position in the rotational direction of the rotating body 4 used during normal operation. This is a setting stopper. 13 is drive shaft 1
This is a bearing that supports one end of the 0.

During normal operation, first, as shown in Figure 1A, the rotating body 4
The blade 7 is located on the downstream side in the traveling direction of the web printing paper 1. In order to prevent the cutting edge of the blade 7 from contacting the surface of the web 1 from above, the rotating body 4 is provided with a stopper on the side surface of the rotating body 4 that fits into the printing press frame so that the rotation stop angle can be set at a constant position. . Then, by the stopper, the rotating body 4
The stopping angle of is fixed at a constant position that does not contact one side of the web printing paper. On the other hand, the paper holding needle 8 is located on the upstream side in the traveling direction of the web printing paper, and is stopped and fixed in a state in which it does not contact the surface of the web printing paper from below, similarly to the downstream side.

To fix the rotating body 4 with the stopper, as shown in FIG. 2, a fitting part 18a provided on the printing press frame 18 side is biased by a spring force from the side of the rotating body 4 to protrude and apply a light external force. The stopper 12, which can be easily retracted against the spring force, is fitted and fixed. The stopper 12 is structured so that it can be easily disengaged from the fitting portion on the printing press frame side by the rotational force generated when the rotating body 4 starts rotating.

If an abnormality such as paper cutting occurs in the running web 1 during operation of the printing press, the clutch 11 shown in FIG. Rotate clockwise in the direction of cutting rotation operation (forward rotation arrow direction) as shown, and cut the web printing paper 1 with the serrated blade 7, while at the same time holding the cut end of the web printing paper 1 with the needle 8 on the opposite side. Printing machine 1 was then rotated at high speed and shredded.
Wind it up and collect it. The rotating body 4 closest to the feeder (unwinding and supplying side of the rolled paper) (for example, the rotating body installed in front of the first printing unit) is
Rotation is stopped when the rotational torque exceeds a certain set value.

In the present invention, even if the traveling web 1 is slack at the time of cutting the web printing paper 1 and there is not enough tension to cut it,
The web printing paper 1 is pulled while being wound around half a turn by the rotating body 4, the slack is removed and sufficient tension is applied, and the blade 7 cuts the paper by a series of continuous rotation operations. It is possible to do so.

FIG. 3 is a front view of another embodiment of the apparatus of the present invention, in which 1 is a running web printing paper, 7 is a cutting blade, 8 is a paper holding needle, and 9 is a rotating body 4. 10 is a drive shaft that is driven and rotated simultaneously with the operation of the printing press body, 11 is an electromagnetic clutch, and 13 is a support for one end of the drive shaft 10. Bearing 14 is a cylindrical outer cylinder that covers the outer periphery of the rotary body 4, and rotates together with the rotary body 4 at least in the direction of rotation during web cutting operation, and 15 is a cylindrical outer cylinder that covers the outer circumference of the rotary body 4. Paper passing holes are provided on both sides in an elongated shape in the axial direction through which the web printing paper 1 is passed, 16 is a rotation receiving part of the outer cylinder 14 attached to the shaft 4a of the inner rotating body 4, and 12 is a normal This is a stopper for setting a fixed position in the rotational direction of the main body of the outer cylinder 14 including the rotating body 4 used during operation.

FIG. 3 In the case of the device according to another embodiment of the present invention, during normal operation, the electromagnetic clutch 11 is released and the rotating body 4 is latched against the outer cylinder body 14.
7 makes it possible to rotate easily with a relatively light force, so that the space 5 and the window hole 15, or the cutting blade 7 attached to the space, the paper holding needle 8, and the window hole 1
5, or by stopping and fixing them at an appropriate relative position (a position where both the cutting blade 7 and the holding needle 8 are housed inside the window hole 15), and the outer cylinder body 14 can be used by It can be used by being stopped and fixed at a fixed position in the rotational direction substantially parallel to the web running direction using the stopper 12 with respect to the printing press body frame 18 with the window hole 15 facing the front.

(Function of the Invention) The device of the present invention closes the clutch 11 of the device when an abnormality occurs in the web printing paper such as paper breakage during printing operation of the web printing paper 1 introduced into the space 5 of the rotating body 4. to rotate the rotating body 4,
The web printing paper 1 can be cut by the tension of the web printing paper 1 and the rotation of the cutting blade 7, and at the same time, the paper holding needle 8 holds the cut end paper, and the shredded web printing paper 1 is wound around the rotating body 4 by high speed rotation. It can be collected and collected.

(Effects of the Invention) When an abnormality occurs in the web printing paper during printing operation, the device of the present invention quickly rotates the rotating body to cut off the running gap, and the paper is placed in a place other than the normal web running path. It is possible to prevent the machine from becoming entangled and to avoid the risk of bending or damaging the machine, and it is also possible to carry out processing operations after paper cutting and operation restart operations extremely efficiently.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an embodiment of the device of the present invention;
FIG. 2 is a front view of one embodiment of the apparatus of the present invention, FIG. 3 is a front view of another embodiment of the apparatus of the invention, and FIG. 4 is a perspective view illustrating an example of a conventional paper cutting apparatus. DESCRIPTION OF SYMBOLS 1... Roll printing paper, 2... Cutting blade, 3... Holder, 4... Rotating body, 4a... Rotating shaft, 5... Space part, 6... Printing cylinder, 7... Cutting blade, 8... Holding needle, 9... Bearing, 10... Drive shaft, 11... Clutch, 12... Stopper, 13... Bearing, 14
... Outer cylinder body, 15 ... Window hole, 16 ... Rotating bearing,
17... Ratchet, 18... Frame, 18a
……Fitting portion.

Claims (1)

[Scope of Claims] 1. A rotating body rotatable about an axis parallel to the printing cylinder axis is provided in the web travel path in the printing unit of the web printing machine, and the web can be passed through the rotating body at least in the diametrical direction. A paper cutting blade is provided downstream of the center of rotation of the rotary body in the web running direction in the space, and a web holding needle is positioned upstream of the rotation center of the rotary body, and A paper cutting device having a winding function, characterized in that a clutch mechanism is installed parallel to the axial direction of a rotating body, and is provided with a clutch mechanism that enables turning on and off of rotational power to the rotating shaft of the rotating body. 2. The rotating body includes an outer cylindrical body that covers the rotating body and rotates concentrically, and the outer cylindrical body is provided with a window hole at a relative position in the diametrical direction of the outer cylindrical body. Claim 1, characterized in that the device is provided with a positioning stopper that positions and fixes the space portion and the passing direction of the window hole, and that can be released from the fixation by the rotational force of the rotating body. The device described.